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Pregnancy: week by week, with the tools to match

Fetal movements, contractions, weight, pregnancy week: what the numbers mean and when to call.

Frequently asked questions

How do I calculate my pregnancy week?

Counting starts from the first day of your last period, not from conception. 12+3 means twelve full weeks and three days. An early ultrasound may still adjust the due date.

When do you feel the baby move?

Usually between weeks 18 and 22, often later with a first baby. From about week 28 the movements have a pattern, and that is when counting makes sense.

When should I go to the hospital with contractions?

The usual rule: every five minutes, about one minute each, for an hour. If your waters break, you bleed or you feel fewer movements, go right away, regardless of the numbers.