Pregnancy is the term used to describe the period in which a fetus develops inside a woman's womb or uterus. Pregnancy usually lasts about 40 weeks, or just over 9 months, as measured from the last menstrual period to delivery. Health care providers refer to three segments of pregnancy, called trimesters. The major events in each trimester are 1. First trimester (week 1 to week 12) 2. Second trimester (week 13 to 28) 3. Third trimester (week 29 to week 40).
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