How many trimesters are there in human pregnancy?

Trimesters of pregnancy:

1. A pregnancy is divided into three stages called trimesters: first trimester, second trimester, and third trimester.
2. Each trimester lasts 12 to 14 weeks and a full-term pregnancy lasts around 40 weeks from the first day of a woman’s last period.
3. A human pregnancy has three trimesters:
   1. First Trimester - 0 to 13 weeks
   2. Second Trimester - 14 to 26 weeks
   3. Third Trimester - 27 to 40 weeks