Aa
So when does 2nd trimester start?
I know this question has been asked before, but I'm not looking for the post lol. So does the 2nd trimester start in the 13th week or 14th week?
The first trimester is weeks 1-13, second trimester is weeks 14-26, and third trimester is weeks 27-40 (that one has the "bonus" week because 40 weeks isn't exactly nine months, it's a week longer). So the second trimester starts at 13w1d, the beginning of the 14th week and the beginning of the fourth month.
Google pregnancy months to weeks, and click images. It will show you many charts that show this stuff.
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