What is a due date?
A due date (medically called the Estimated Due Date or EDD) is the date your baby is expected to be born — calculated as 280 days (40 weeks) from the first day of your last menstrual period (LMP). It's an estimate, not a deadline. Only about 5% of babies arrive on the exact due date, while ~80% are born within 2 weeks before or 2 weeks after.
The due date is used by your healthcare provider to: (1) schedule prenatal appointments and screening tests at the right gestational ages, (2) monitor fetal growth (a baby measuring large or small for their age may signal complications), (3) plan for delivery (induction may be considered if you go past 41 weeks), and (4) decide when interventions are appropriate (e.g., steroids for fetal lung maturity if preterm labor threatens before 34 weeks).
Pregnancy is medically counted from LMP, not conception. So when you're told "you're 8 weeks pregnant," conception actually occurred ~6 weeks ago. The first 2 weeks of "pregnancy" technically happen before conception. This convention has been the standard since 1812 (Naegele's rule), because LMP is far easier to remember than the day of conception.
How due dates are calculated
The standard medical formula is Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period. This assumes a 28-day cycle with ovulation on day 14 and conception on the same day. Pregnancy is medically counted from LMP, not conception, even though you're not actually pregnant during the first ~2 weeks.
Due Date = LMP + 280 days
Naegele's rule (1812) — still the standard worldwide
Only about 5% of babies are actually born on the exact due date. Most arrive within a 5-week window — between 37 weeks (full term) and 42 weeks (postterm). Your due date is a target, not a deadline.
4 calculation methods compared
| Method | Formula | Accuracy |
|---|---|---|
| LMP (Naegele's) | LMP + 280 days | ±1 week (assumes 28-day cycle) |
| Conception date | Conception + 266 days | ±3 days if known precisely |
| Early ultrasound | Adjusted from CRL measurement | ±5 days (most accurate) |
| IVF transfer | Day-3: +263 days; Day-5: +261 days | Exact (known fertilization) |
Worked examples for each method
Let's walk through how each method calculates a due date using the same starting point — let's say it's January 15, 2026 today and you want to know your due date.
Example 1 — LMP method
Last period started December 1, 2025. EDD = Dec 1, 2025 + 280 days = September 7, 2026. You're currently ~6 weeks 3 days pregnant.
Example 2 — Conception date method
You know you conceived on December 18, 2025 (e.g., from ovulation tracking). EDD = Dec 18, 2025 + 266 days = September 10, 2026. Slight 3-day difference from LMP method due to assumed 14-day ovulation timing.
Example 3 — Ultrasound method
Today's scan (Jan 15, 2026) shows baby measures 8 weeks 2 days. Gestational age in days = 58. LMP-equivalent = Jan 15 - 58 days = November 18, 2025. EDD = LMP-equivalent + 280 = August 25, 2026. Most accurate (±5 days) because it measures actual fetal size.
Example 4 — IVF Day-5 transfer
You had a Day-5 blastocyst transfer on December 22, 2025. EDD = Transfer + 261 days = September 9, 2026. Most precise method since fertilization is exactly known.
Notice how each method gives slightly different dates? This is normal — the methods make different assumptions about cycle length and ovulation timing. Your provider will pick the most reliable method for you (usually first-trimester ultrasound) and that becomes your "official" due date for the rest of pregnancy.
Trimesters and key milestones
First trimester · weeks 1–13
Major organ development. Heartbeat often detectable around week 6. NIPT genetic screening from week 10. End of first trimester: miscarriage risk drops significantly. Common: morning sickness, fatigue, breast tenderness.
Second trimester · weeks 14–27
Often the most comfortable phase. Anatomy scan at 18–22 weeks (often when sex is revealed). First "quickening" (baby's kicks) typically felt at 18–22 weeks. Glucose tolerance test at 24–28 weeks. Belly visibly grows.
Third trimester · weeks 28–40
Rapid weight gain and growth. Group B strep test around week 35–37. Full term at week 37 — baby is considered ready. Typical delivery between 37 and 42 weeks. Weekly checkups from week 36 onward.
Complete week-by-week timeline
| Week | Baby's development | Mom's experience |
|---|---|---|
| 1-4 | Fertilization, implantation. Embryo size: poppy seed. | Missed period. Positive home test possible. |
| 5-6 | Heart begins beating. Brain forming. Size: lentil. | Nausea may begin. Sore breasts, fatigue. |
| 7-8 | Tiny limb buds, facial features forming. Size: blueberry. | First prenatal visit usually scheduled. |
| 9-10 | Now technically a fetus. Fingers, toes forming. Size: grape. | NIPT genetic screening available. Morning sickness peak. |
| 11-13 | Nuchal translucency scan window. All organs present. Size: lime. | End of first trimester. Miscarriage risk drops sharply. |
| 14-17 | External genitals form. Baby moves but mom doesn't feel it. Size: pear. | Energy returns. "Honeymoon" trimester begins. |
| 18-22 | Anatomy ultrasound, often sex revealed. Size: bell pepper. | First "quickening" felt. Visible bump. |
| 23-27 | Viability at week 24 (with NICU). Hearing develops. Size: papaya. | Glucose tolerance test. Round ligament pain may appear. |
| 28-31 | Brain rapidly developing. Eyes open. Size: eggplant. | Third trimester starts. Visits move to every 2 weeks. |
| 32-35 | Major organs nearly mature. Gaining 0.5 lb/week. Size: pineapple. | Heartburn, swelling, sleep difficulty. Group B strep test. |
| 36-38 | Considered "early term" at 37. Lungs mostly mature. Size: honeydew. | Weekly visits. Cervical checks may begin. Pack hospital bag. |
| 39-42 | Full term at 39-40. Watch for labor signs. | Labor can begin any time. Induction discussed past 41 weeks. |
Prenatal appointment schedule
Standard schedule for low-risk pregnancies (high-risk = more frequent):
- Weeks 8-10: First prenatal visit. Bloodwork, urine, weight/BP baseline, often dating ultrasound.
- Weeks 11-13: Nuchal translucency scan + first-trimester screening for chromosomal anomalies.
- Every 4 weeks until 28: Routine checkups — weight, BP, urine dip, fundal height, fetal heart tones.
- Weeks 18-22: Anatomy ultrasound (most exciting visit — often sex reveal).
- Weeks 24-28: Glucose tolerance test (gestational diabetes screen) + Tdap vaccine + RhoGAM if Rh-negative.
- Every 2 weeks from 28-36: More frequent monitoring as third trimester progresses.
- Weeks 35-37: Group B strep swab. Discuss birth plan and labor signs.
- Weekly from 36 to delivery: Cervical checks may begin. Watch for labor.
Total typical visits: 12-15 over the course of pregnancy. Postpartum follow-up at ~6 weeks. Many practices now offer telehealth for routine visits.
Tests and screenings during pregnancy
| Test | When | Purpose |
|---|---|---|
| Blood type / Rh | First visit | Determines if RhoGAM needed at 28 wks. |
| CBC + iron | First visit + 28 wks | Screen for anemia. |
| NIPT (cell-free DNA) | 10+ weeks | Screens for Down syndrome, trisomies. 99%+ accurate. |
| Nuchal translucency | 11-13 wks | Combined with bloodwork screens for chromosomal issues. |
| Anatomy ultrasound | 18-22 wks | Detailed scan of all organs + sex. |
| Glucose tolerance | 24-28 wks | Screens for gestational diabetes. |
| Tdap vaccine | 27-36 wks | Protects baby from whooping cough. |
| Group B strep | 35-37 wks | If positive, antibiotics during labor. |
Optional diagnostic tests (only if screening abnormal): CVS (10-13 wks), amniocentesis (15-20 wks). Both have ~0.1% miscarriage risk.
How accurate is your due date?
Due date estimates from LMP can be off by a week or more if your cycle isn't exactly 28 days. An early ultrasound (8–12 weeks) measuring crown-rump length (CRL) is the gold standard for dating — accurate within ±5 days.
If your ultrasound dates differ from LMP dates by more than:
- 5 days in the first trimester (up to 13 6/7 weeks) → due date is usually adjusted
- 10 days in early second trimester (14 0/7 to 15 6/7 weeks) → adjusted
- 14 days in mid second trimester (16 0/7 to 21 6/7 weeks) → adjusted
- 21 days+ in third trimester → ultrasound less reliable; LMP usually kept
Reality check: The 40-week due date is just the midpoint of normal pregnancy length. About 80% of babies arrive between 37 and 42 weeks — anywhere from 3 weeks early to 2 weeks late is considered normal.
Nutrition and weight gain
Pregnancy nutrition isn't about "eating for two" — it's about eating more of the right things. Caloric needs increase modestly: +0 calories first trimester, +340 second, +450 third (per ACOG). Total weight gain depends on pre-pregnancy BMI:
| Pre-pregnancy BMI | Singleton gain | Twin gain |
|---|---|---|
| Underweight (<18.5) | 28-40 lbs | ~50-62 lbs |
| Normal (18.5-24.9) | 25-35 lbs | 37-54 lbs |
| Overweight (25-29.9) | 15-25 lbs | 31-50 lbs |
| Obese (≥30) | 11-20 lbs | 25-42 lbs |
Foods to emphasize: leafy greens (folate), salmon (DHA), eggs (choline), Greek yogurt (calcium + protein), legumes (iron), fortified whole grains, fruits, lean proteins.
Foods to avoid: raw fish/oysters/sushi (listeria), high-mercury fish (swordfish, king mackerel, shark, tilefish), unpasteurized cheese/milk, deli meats unless heated to steaming, raw or undercooked eggs/meat, raw sprouts, more than 200mg caffeine/day (~1 cup coffee), all alcohol.
Use our BMI Calculator to find your pre-pregnancy BMI category and our TDEE Calculator to estimate maintenance calories before adding pregnancy adjustments.
Exercise during pregnancy
ACOG recommends 150 minutes of moderate-intensity exercise per week for healthy pregnant women. Benefits: improved mood, better sleep, easier labor, faster postpartum recovery, lower risk of gestational diabetes (~30% reduction), preeclampsia (~30% reduction), and excessive weight gain.
Safe activities: Walking, swimming, stationary cycling, low-impact aerobics, prenatal yoga or Pilates, light strength training. If you exercised regularly before pregnancy, you can usually continue at a moderate intensity.
Activities to avoid: Contact sports (soccer, basketball, hockey), high-fall-risk (skiing, horseback, gymnastics), scuba diving, hot yoga or hot Pilates, exercise in heat/humidity, lying flat on back after week 20 (use slight incline), heavy lifting that strains.
Stop and call doctor if: vaginal bleeding, dizziness, headache, chest pain, calf swelling, contractions, fluid leak, decreased fetal movement.
Always clear exercise plans with your provider — especially if you have placenta previa, cervical insufficiency, preeclampsia, severe anemia, or other complications.
Warning signs — call your provider
Call your OB or midwife (or go to the ER if severe) for any of these:
- Vaginal bleeding — any bleeding after first trimester; heavy bleeding any time.
- Severe abdominal pain — especially if persistent or one-sided.
- Severe headache + vision changes (blurred, spots) — possible preeclampsia.
- Sudden swelling of face/hands + headache — possible preeclampsia.
- Decreased fetal movement after 28 weeks — fewer than 10 kicks in 2 hours during peak time.
- Fluid leaking from vagina — possibly broken water (PROM).
- Contractions before 37 weeks — every 10 min or more often, lasting an hour.
- Severe nausea/vomiting + can't keep liquids down — possible hyperemesis.
- Fever over 100.4°F (38°C) — possible infection.
- Painful urination + back pain — possible kidney infection.
- Signs of DVT — calf pain, swelling, redness in one leg.
- Fall, car accident, or trauma — get checked even if you feel fine.
When in doubt, call. Most OB offices have a 24/7 nurse line. Better to call and be reassured than to wait.
Preparing for labor
Start preparing around week 32-34:
- Take childbirth classes (in-person or online). Most hospitals offer them free.
- Tour your hospital or birth center — know where to park, where to go.
- Pack a hospital bag by week 36 — labor can start any time.
- Choose a pediatrician — most accept newborns within 48 hrs of discharge.
- Install car seat by week 37 — most fire stations will check it for free.
- Discuss birth preferences with your provider (epidural, doula, episiotomy preferences, immediate skin-to-skin, delayed cord clamping).
- Set up baby essentials: crib/bassinet, safe sleep area, diapers (NB + size 1), wipes, a few outfits.
- Stock the freezer — pre-make meals; you'll be too tired to cook the first 2-3 weeks.
- Plan FMLA / parental leave with HR by week 30. Submit paperwork early.
- Add baby to insurance within 30-60 days of birth (deadline varies by plan).
Signs of labor: regular contractions getting stronger (5-1-1 rule: every 5 min, 1 min long, for 1 hour), bloody show (mucus plug), water breaking (gush or trickle of fluid), persistent low backache.
If your due date passes
About 60% of first-time pregnancies and 25% of subsequent pregnancies go past the due date. Reaching 41+ weeks is called "late-term"; past 42 weeks is "postterm". Risks rise after 41 weeks: decreased amniotic fluid, placental aging, larger baby (shoulder dystocia risk), meconium aspiration, stillbirth.
Standard practice: Most providers schedule induction by 41-42 weeks. Some offer earlier induction (39-40 weeks) based on the 2018 ARRIVE trial showing no harm and possible benefit. Discuss timing with your provider.
Methods to encourage labor (limited evidence): walking, sex (semen contains prostaglandins), nipple stimulation, evening primrose oil, acupuncture/acupressure, membrane sweep at 38+ weeks (medically performed by your provider). Castor oil works for some but causes severe diarrhea.
Medical induction methods: cervical ripening with prostaglandins (Cervidil, Cytotec), Foley balloon, IV oxytocin (Pitocin), artificial rupture of membranes (AROM/amniotomy). Most inductions take 12-24+ hours.
Twins and multiples
About 3% of pregnancies in the US are twins. The "due date" still uses the 40-week LMP calculation, but twins typically arrive earlier:
- Twins: average delivery at 35-36 weeks. Goal full-term: 37-38 weeks.
- Triplets: average 32-33 weeks.
- Quadruplets: average 29-31 weeks.
Twin pregnancies require more frequent prenatal visits, more ultrasounds (every 4-6 weeks for growth), higher caloric and nutritional needs, and increased risks of preterm labor, gestational diabetes, preeclampsia, and C-section. Most twins are born by C-section if Twin A is breech or by 38 weeks regardless. Use our calculator with LMP method — the EDD is the same target, but understand twins almost never make it to 40 weeks.
Types of twins: Dichorionic-Diamniotic (di/di) — separate placentas, separate sacs (most common, lowest risk). Monochorionic-Diamniotic (mo/di) — shared placenta, separate sacs (TTTS risk). Monochorionic-Monoamniotic (mo/mo) — shared everything (highest risk, hospitalization at ~26 weeks common).
Common pregnancy myths debunked
- "You're eating for two." No — you need only 0-450 extra calories per day depending on trimester, not 2,000.
- "You can predict baby's sex from belly shape." False. Position depends on baby's posture, your build, and how many pregnancies you've had — not sex.
- "Heartburn means a hairy baby." Surprisingly, this folk wisdom has some weight — a 2006 Johns Hopkins study found a real correlation. But heartburn is mainly hormonal, so don't take it as guarantee.
- "Avoid all caffeine." Up to 200mg/day (~1 cup of coffee) is considered safe by ACOG.
- "Don't dye your hair." Hair dye is considered safe. Limited chemical absorption through scalp.
- "You can't fly while pregnant." Most airlines allow flying until 36 weeks (28 for international). Stay hydrated, walk, wear compression socks.
- "Spicy food induces labor." No reliable evidence. May give you heartburn.
- "You shouldn't lift your arms above your head." Total myth — won't wrap the cord.
- "Bath water can drown the baby." No — the cervix is sealed shut by mucus plug. Hot baths over 100°F should be avoided in the first trimester though.
- "Sex during pregnancy is dangerous." Generally safe unless you have placenta previa, cervical issues, or your provider says otherwise.
Pregnancy glossary
- EDD (Estimated Due Date)
- The 40-week mark from LMP — your "due date."
- LMP (Last Menstrual Period)
- First day of your last period — the standard starting point for pregnancy dating.
- Gestational age
- Weeks since LMP. The "you're X weeks pregnant" number.
- CRL (Crown-Rump Length)
- Embryo measurement on first-trimester ultrasound used to date pregnancy precisely (±5 days).
- NIPT
- Non-Invasive Prenatal Testing — blood test from week 10 screening for chromosomal disorders. 99%+ accurate.
- Quickening
- The first time you feel the baby move. Typically weeks 18-22 (sometimes earlier in subsequent pregnancies).
- Trimester
- Pregnancy is divided into three roughly equal phases — 1st (weeks 1-13), 2nd (14-27), 3rd (28-40).
- Viability
- ~24 weeks — the point where survival outside the womb becomes possible with NICU care.
- Full term
- 37 weeks (early term) to 41 weeks. Optimal: 39-40 weeks (full term).
- Preterm
- Born before 37 weeks. Late preterm: 34-36 wks. Very preterm: under 32 wks.
- Postterm
- 42+ weeks. Risks rise; induction usually recommended by 41-42 weeks.
- Naegele's rule
- Add 280 days to LMP. The 1812 formula still used worldwide.
- PROM
- Premature Rupture Of Membranes — water breaks before labor starts.
- PPROM
- Preterm PROM — water breaks before 37 weeks. Hospital admission usually required.
Frequently asked questions
How is my due date calculated?
The standard method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a 28-day cycle with ovulation on day 14. If you know your conception date, the calculator adds 266 days. If you have an early ultrasound, the calculator uses the gestational age measured at the scan, which is the most accurate method (within ±5 days in the first trimester).
How accurate is my due date?
Only about 5% of babies are born on their actual due date. Around 80% of births happen between 37 weeks (full-term) and 42 weeks. Early ultrasounds in the first trimester are most accurate (±5 days); LMP-based estimates can be off by a week or more if your cycle isn't exactly 28 days. Late ultrasounds (third trimester) are less accurate for dating because babies grow at different rates.
What's the difference between LMP and conception date?
LMP (Last Menstrual Period) is the first day of your last period — easier to remember and the standard medical reference point. Conception is when sperm meets egg, typically about 14 days after LMP for a 28-day cycle. Pregnancy is measured from LMP, so when your doctor says you're '8 weeks pregnant,' you actually conceived about 6 weeks ago.
What if I had IVF?
IVF gives the most precise dating because the conception date is exactly known. For Day-3 embryo transfer, your due date is transfer date + 263 days. For Day-5 (blastocyst) transfer, it's transfer date + 261 days. The calculator handles both — select 'IVF transfer date' and choose Day 3 or Day 5.
What are the trimesters?
First trimester: weeks 1–13 (organ development, morning sickness common). Second trimester: weeks 14–27 (often the most comfortable phase, anatomy ultrasound at 18–22 weeks, baby's first kicks usually felt). Third trimester: weeks 28–40 (rapid weight gain, gestational diabetes screening, delivery preparation).
What does 'full term' mean?
Pregnancy is considered full-term from 37 weeks. Earlier classifications: Early term (37 0/7 to 38 6/7 weeks), Full term (39 0/7 to 40 6/7 weeks), Late term (41 0/7 to 41 6/7 weeks), Postterm (42+ weeks). Babies born before 37 weeks are 'preterm' and may need NICU care depending on how early.
When should I have my first prenatal appointment?
Schedule your first appointment as soon as you confirm pregnancy with a positive home test, typically between 8 and 10 weeks. The first visit usually includes blood work, urine test, weight/blood pressure baseline, medical history, and often an early ultrasound to confirm dates and detect a heartbeat. Subsequent appointments are typically every 4 weeks until 28 weeks, every 2 weeks until 36 weeks, and weekly after that.
Can I tell the baby's sex from the due date calculator?
No — sex is determined at conception by the sperm's chromosome (XX or XY) and isn't related to the due date. To find out: NIPT blood test (typically available at 10 weeks, 99%+ accurate), CVS (10–13 weeks, diagnostic), amniocentesis (15–20 weeks, diagnostic), or anatomy ultrasound (typically 18–22 weeks, ~95% accurate when baby cooperates).
How is my pregnancy week counted?
Pregnancy is counted in weeks from the first day of your last menstrual period (LMP). At 4 weeks, your period is about a week late. At 6 weeks, the embryo's heartbeat is often detectable. At 12 weeks, end of first trimester. At 20 weeks, halfway. At 28 weeks, third trimester begins. At 37 weeks, full term. At 40 weeks, due date. Each week is divided into days (e.g., '14 weeks 3 days').
What if my cycle isn't 28 days?
The standard LMP-based calculation assumes a 28-day cycle with ovulation on day 14. If your cycle is longer (e.g., 32 days), you ovulated later, so your due date is about 4 days later than the standard calculation suggests. An early ultrasound (8–12 weeks) will give a more accurate due date and may push your dates by several days. Most providers will adjust your due date based on the ultrasound if it differs from LMP-based dating by more than 5–7 days in the first trimester.
What are the key milestones to know?
Week 6: heartbeat often detectable. Week 10: NIPT genetic screening becomes available. Week 12: end of first trimester, low miscarriage risk. Week 18–22: anatomy ultrasound, often sex revealed. Week 24: viability threshold. Week 24–28: glucose tolerance test for gestational diabetes. Week 28: third trimester. Week 35–37: Group B strep test. Week 37: full term. Week 39: scheduled C-sections typically allowed. Week 40: due date. Week 42: postterm — induction often recommended.
Is this calculator a substitute for medical care?
No — this calculator gives an estimate based on dates only. Your healthcare provider may adjust your due date based on ultrasound measurements, fundal height, or other clinical findings. Always confirm dates with your OB or midwife. This tool doesn't replace prenatal care, screening, or any medical advice.
What's the difference between gestational age and fetal age?
Gestational age is counted from the first day of LMP (the medical standard) and includes the ~2 weeks before conception. Fetal (or embryonic) age is counted from the day of conception, so it's about 2 weeks SHORTER. When your doctor says 'you're 12 weeks pregnant,' the embryo is actually only ~10 weeks old. All medical milestones, ultrasound dating, and due dates use gestational age. Pregnancy apps usually display gestational age too.
What if I conceived through frozen embryo transfer (FET)?
Frozen embryo transfers (FET) calculate due date the same as fresh IVF: due date = transfer date + 263 days (Day-3 embryo) or + 261 days (Day-5 blastocyst). The freezing/thawing time doesn't count — only the embryo's developmental age at transfer matters. If your clinic used a different embryo age (like Day-6), ask them for the exact due date.
Can I take a pregnancy test based on this calculator?
The calculator estimates due date, not when to test. Home pregnancy tests detect hCG hormone, which becomes reliable at: 1 day after missed period (~95% accuracy), 1 week after missed period (~99%). For a 28-day cycle, that's around week 4 of gestational age (or 2 weeks post-conception). Early Detection tests (e.g., First Response Early Result) can sometimes detect hCG 5-6 days before missed period but with lower accuracy. Confirm with a blood test (quantitative hCG) at your doctor.
What is the 'rule of nines' or '9-month' calculation?
Pregnancy is commonly described as 9 months but is actually 40 weeks (just over 9 calendar months — 9 months × 30.4 days = 274 days vs 40 × 7 = 280 days). 'Month' counting is informal; the medical standard is weeks. From LMP: month 1 = weeks 1–4, month 2 = weeks 5–8, etc. This is why moving from 'month' to 'week' can feel confusing — they don't line up cleanly.
When can I find out the baby's sex?
Several options: (1) NIPT (Non-Invasive Prenatal Testing) blood test — earliest at 10 weeks, 99%+ accurate. (2) Anatomy ultrasound — 18-22 weeks, ~95% accurate when baby cooperates. (3) CVS (Chorionic Villus Sampling) — 10-13 weeks, 99% accurate but invasive. (4) Amniocentesis — 15-20 weeks, 99% accurate but invasive. (5) Earlier 'gender' ultrasounds at 14-16 weeks (sometimes called 'early sex scan') — less reliable. Most parents who want to know wait for NIPT or anatomy scan.
What if my due date passes without labor starting?
Common — about 60% of first-time moms go past their due date. Doctors typically allow pregnancy to continue until 41-42 weeks before recommending induction. After 42 weeks (postterm), risks like decreased amniotic fluid and placental aging increase. Most providers schedule induction by 41-42 weeks. Membrane sweeps (38+ weeks), exercise, and natural methods may help, but most have limited evidence. Talk to your OB if you're approaching or past 41 weeks.
How long is each trimester in months?
First trimester: weeks 1-13 (about 3 months). Second trimester: weeks 14-27 (about 3.5 months). Third trimester: weeks 28-40 (about 3 months). Total: ~9.3 calendar months. The trimesters aren't perfectly equal because pregnancy is measured in weeks, not months. The 'baby is ready' window opens at 37 weeks (early term) and full-term is 39-40 weeks.
What prenatal vitamins should I take?
Start prenatal vitamins as soon as you're trying to conceive (or before pregnancy is detected, since neural tube development starts in week 3-4). Key nutrients: 400-800mcg folic acid (prevents neural tube defects), 27mg iron, 1000mg calcium, 600 IU vitamin D, DHA omega-3 (for brain development), iodine 150mcg. Standard OTC prenatals (Centrum, Nature Made, One A Day) cover the basics. Discuss with your provider — some need extra iron, vitamin D, or B12.
When does morning sickness start and end?
Morning sickness typically starts around week 6, peaks at weeks 9-10, and resolves by weeks 12-14 for most women. Despite the name, it can occur any time of day. About 70-80% of pregnant women experience nausea/vomiting; ~3% develop hyperemesis gravidarum (severe, needs medical treatment). Coping: small frequent meals, ginger, vitamin B6, prescription medications (Diclegis, Zofran). Severe vomiting + dehydration warrants ER visit.
Can I exercise during pregnancy?
Yes — for most pregnancies, ACOG recommends 150 minutes of moderate exercise per week (e.g., walking, swimming, prenatal yoga, stationary bike). Benefits: better mood, easier labor, faster recovery, lower risk of gestational diabetes and preeclampsia. Avoid: contact sports, high fall risk activities (skiing, horseback riding), scuba diving, exercises lying flat on back after 20 weeks, hot yoga/saunas. Always check with your provider first if you have complications.
What weight gain is normal in pregnancy?
Recommendations from Institute of Medicine, based on pre-pregnancy BMI: Underweight (BMI <18.5): gain 28-40 lbs. Normal weight (18.5-24.9): gain 25-35 lbs. Overweight (25-29.9): gain 15-25 lbs. Obese (30+): gain 11-20 lbs. Twins: add 10-20 lbs to each range. First trimester: 1-5 lbs total. Second/third trimester: ~1 lb/week. Use our <a href='/bmi-calculator' class='text-[#0E6A62] underline'>BMI Calculator</a> to find your pre-pregnancy category.
What is preterm labor and how do I recognize it?
Preterm labor is contractions causing cervical changes before 37 weeks. Warning signs: regular contractions (every 10 min or more often) for an hour, low dull backache, pelvic pressure, vaginal bleeding or fluid leaking, abdominal cramps. Call your provider IMMEDIATELY if any occur before 37 weeks. Risk factors: prior preterm birth, multiple gestation, infection, smoking, substance use, short cervix. Treatment: rest, hydration, sometimes medications (tocolytics, steroids for fetal lung maturity).