I think second trimester starts at 13 weeks, but I know it changes everywhere! We had this discussion in 3rd tri, some people said 27 weeks and some said 28 weeks, I think you know in yourself and how you feel when you feel like you've gone up a trimester, but it my notes, 1st tri is up to 13 weeks, 2nd tri is 13-27 and 3rd tri 27+ but that's just what I go by
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