23h 53min, sep 7, 2002 y - Pregnancy is measured in trimesters from the first day of your last menstrual period, totaling 40 weeks. The first trimester of pregnancy is week 1 through week 12, or about 3 months. The second trimester is week 13 to week 27. And the third trimester of pregnancy spans from week 28 to the birth.
Description:
https://www.webmd.com/baby/tc/pregnancy-your-first-trimester
Added to timeline:
baby development timeline.
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