4 pregnancy trimester guides
Pregnancy trimesters, week by week
Pregnancy is divided into three trimesters of about 13 weeks each, counted from the first day of your last period. These guides set out where each one starts and ends, what develops, and which appointments, scans and warning signs belong to it.
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TrimestersFirst Trimester: How Many Weeks It Lasts and What HappensThe first trimester runs to week 12 (NHS) or 13 weeks 6 days (ACOG). What develops, common…TrimestersPregnancy Trimesters Broken Down by Weeks and MonthsPregnancy trimesters broken down by weeks: the NHS ends the first at week 12, ACOG at 13 weeks 6…TrimestersSecond Trimester: Weeks, Symptoms, Scans and MovementsThe second trimester runs from week 13 to 27 on the NHS count, or 14 to 27 weeks 6 days for ACOG.…TrimestersThird Trimester: When It Starts, Symptoms and Signs of LabourThe third trimester starts at 28 weeks for the NHS, ACOG and HSE, and at week 27 in Australia.…