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Pregnancy: what to expect trimester by trimester and how to prepare

Every pregnancy is different. Here is what most people experience at each stage and what to do about it.

First trimester (weeks 1–12)

The first trimester is often the hardest — extreme fatigue, nausea and the anxiety of an early pregnancy that is not yet visible to others. The booking appointment (weeks 8–10) with your midwife is the most important first step. The 12-week dating scan confirms the due date and screens for chromosomal conditions. Keep a pregnancy journal from week 8 — the detail fades faster than you expect.

Second trimester (weeks 13–27)

For most people, the second trimester is the easiest. Energy returns, nausea typically subsides and the bump becomes visible. The 20-week anomaly scan is the most detailed scan of the pregnancy. Begin planning maternity leave and start the baby registry checklist.

Third trimester (weeks 28–40)

Increasing physical discomfort, preparation and anticipation. Work through our free third trimester checklist — by 36 weeks, the hospital bag should be packed, the birth preferences written and the nursery ready. The baby can arrive from 37 weeks at full term.

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Frequently asked questions

When should I tell people I am pregnant?
Most people wait until after the 12-week scan when the risk of miscarriage drops significantly. Some tell close family and friends earlier for support. There is no right answer — tell people when you are ready to also tell them if things go wrong.
What are the most important pregnancy appointments?
Booking appointment (8–10 weeks), 12-week dating scan, 20-week anomaly scan, and growth scans if recommended. Plus regular midwife appointments at weeks 16, 25, 28, 31, 34, 36, 38 and 40 for a first-time pregnancy.