Pregnancy
Track your journey, week by week.
Pregnancy · Blog
Articles about Pregnancy
LMP, IVF, ultrasound dating. ACOG, CDC, FDA, IOM 2009 — with the fourth trimester covered.
Pregnancy guides for English-speaking readers cite ACOG (American College of Obstetricians and Gynecologists), CDC, and FDA mercury fish lists. Naegele's rule (LMP + 280 days) is standard, but IVF transfer or ultrasound CRL gives more accurate dating. We cover prenatal nutrition (600 mcg folic acid, fish to avoid), weight gain by IOM 2009 BMI categories, and the ACOG Committee Opinion 736 on the fourth trimester (the postpartum 12-week recovery window).
What this category covers
- Pregnancy week — LMP, IVF transfer, ultrasound CRL
- Prenatal nutrition — 600 mcg folic acid, FDA fish-to-avoid list
- Weight gain — IOM 2009 by pre-pregnancy BMI
- Fourth trimester — ACOG Committee Opinion 736
Primary sources
- ACOG — Committee Opinion 700 (gestational age) and 736 (fourth trimester)
- CDC — pregnancy and reproductive health
- FDA — fish advice for pregnancy and breastfeeding
Want to use the tool directly? Head to Pregnancy. The articles below are sorted newest first.
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Postpartum Care — The Fourth Trimester, ACOG 12-Week Plan (2026)
ACOG redefined postpartum care as a 12-week journey, not a single 6-week checkup. The fourth trimester guide covering recovery, mental health, FMLA, and the redesigned U.S. postpartum care map.
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Pregnancy Nutrition — Folic Acid, Fish, and What ACOG Actually Says (2026)
ACOG and FDA guidance on prenatal vitamins, 600 mcg folic acid, mercury-safe fish, vitamin D, choline, and omega-3 — written for U.S. expectant parents using the pregnancy due-date calculator.
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Pregnancy Weight Gain — IOM 2009 Guidelines and What ACOG Says (2026)
Underweight 28-40 lb, normal 25-35 lb, overweight 15-25 lb, obese 11-20 lb. The IOM 2009 guidelines ACOG continues to endorse, plus week-by-week pacing and gestational diabetes screening.
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Due date + 40-week prenatal calendar — ACOG visit schedule (2026)
Due date from LMP, ovulation, or IVF transfer — plus every prenatal visit, anatomy scan, GTT, and GBS screening on one ACOG calendar. FMLA 12-week leave planning included.
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Pregnancy dating in 1 second — LMP, ovulation, IVF transfer (2026)
A positive test starts the clock. Free calculator with all three dating starts — LMP, ovulation, IVF transfer — plus ACOG-aligned prenatal visit timing on one screen.