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How many weeks are there in a trimester?

There are 3 trimesters in a pregnancy. The first trimester approximately lasts from week 1 to week 13, the second trimester nearly lasts from week 14 to week 27 and the third trimester lasts from week 28 to week 40 (and it may go up). Basically, there are 13 (or 14) weeks in each trimester