When do you think the second trimester starts?

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This chart will help. Click on it to make it bigger.

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People say 13 because they divide 40 by 3 but that's not how it really works. Trimester is a developmental thing. They finish the first trimester developmental milestones by 14 weeks which is 12 weeks gestation. (14 weeks from LMP)

It truly doesn't matter, of course. Just a little fact that's annoying to me that some docs say differently to people.

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I've seen that chart! It breaks it down really well, my doctor just personally says the second trimester starts at 13 weeks. I don't think it really matters! Lol you're still going to be pregnant for 40(ish) weeks, so what's a week? :)

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I hit the wrong one, its 13wks not 14...