What pregnancy week 37 means
Early term. “37 weeks pregnant” means 37 weeks have passed since the first day of the last menstrual period — the standard way pregnancy is dated. Conception usually happened about two weeks after that date, so the baby’s own age (fetal age) is roughly 35 weeks. Week 37 runs from 37 weeks 0 days to 37 weeks 6 days; on the following day the pregnancy is 38 weeks.
Your baby at 37 weeks
At 37 weeks a pregnancy is considered early term. The baby is practising breathing, sucking and grasping, and is gaining about 200 grams a week.
A common way to picture it: the baby is now about the size of a winter melon — roughly about 48.6 cm and about 2.9 kg. These are averages; babies grow at different rates, and ultrasound measurements vary.
Your body at 37 weeks
You may notice more Braxton Hicks contractions, a heavier feeling in the pelvis or loss of the mucus plug. None of these alone mean labour is about to start.
Care and appointments around week 37
It is a good time to review the signs of labour with your provider: regular, strengthening contractions, waters breaking, or bleeding.
The timing of tests and appointments differs between countries and care providers. If anything worries you — such as bleeding, severe pain, fluid leaking, fever, or a change in your baby’s movements — contact your midwife, doctor or maternity unit straight away rather than waiting for your next appointment.
Week 37 in your pregnancy timeline
Week 37 is in the third trimester (weeks 28–40+) and in pregnancy month 9, which covers roughly weeks 36–40. Full term begins at 39 weeks, 2 weeks from now.
| Pregnancy start (first day of last period) | |
|---|---|
| Estimated conception | |
| Full term (39 weeks) | |
| Estimated due date (40 weeks) |
Dates assume you are exactly 37 weeks 0 days today. For dates based on your own last period, use the calculator above or the main Pregnancy Calculator.
37 weeks pregnant in days and months
37 weeks is 259 days of pregnancy — 93% of a 40-week pregnancy. Counted in calendar months, 37 weeks is about 8.5 months, which is usually described as month 9 of pregnancy. Months are only a rough grouping; healthcare professionals almost always talk in weeks and days because they are more precise. See Pregnancy Month Calculator for how weeks map to months.