How To Track Your Pregnancy Week By Week
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How pregnancy is dated
Pregnancy is counted in weeks, not months — 40 weeks total from last menstrual period (LMP) to due date. That’s roughly 9 calendar months but actually 10 lunar months, which is why the timing feels inconsistent. This guide walks through how pregnancy is dated, what happens at each trimester, the appointments that matter, and the normal-range symptoms people often worry about unnecessarily.
The three trimesters
If cycles are irregular or LMP is unknown, an early ultrasound (weeks 7-12) dates the pregnancy more accurately by measuring crown-rump length.
Appointment schedule — typical US/UK
Only ~5% of babies arrive on the exact due date. “Full term” is 37-42 weeks; anything in that range is normal timing.
What’s happening week by week — condensed
IOM (Institute of Medicine) recommendations, based on pre-pregnancy BMI:
Symptoms — what’s normal, what to call about
Most gain is in the second and third trimesters (~1 lb / week). Individual variance is high.
Weight gain guidance
About 25% of first-time parents deliver on or before the due date; 75% after. Only ~5% deliver exactly on the EDD.
Nutrition essentials
Reframe the due date as “sometime in weeks 39-41” rather than a specific day. Planning work, childcare, and visitors with a week-long window reduces stress when the baby arrives at week 40+4 or week 39+2.