When does the second trimester ACTUALLY begin?

The internet seems to be completely torn. One website will say it starts at 13 weeks. Another right under it says 14 weeks. Then the next says 13 weeks. And so on! I’m 13 weeks tomorrow and I just want to be in the second trimester already!
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I thought it was 14 weeks! & my baby apps say 14 weeks. But I could be wrong 😊

A full term pregnancy is 10 months, not 9 so it’s not exactly 3 + 3 + 3 months. It’s broken down like 3.33 and so on. Most February mommas are entering the 2nd trimester or about to.

According to the American College of Obstetricians and Gynecologists, the second trimester begins at 14 weeks. Here's a link, you can find the info under "How is the length of my pregnancy messured?": https://www.acog.org/womens-health/faqs/how-your-fetus-grows-during-pregnancy#:~:text=Trimesters%3A%20The%203%2Dmonth%20periods,used%20to%20check%20the%20fetus.

If you’re 13 weeks tomorrow, go ahead and say you’re in your second tri!! You can get technical down to the day but who cares. Rarely anyone gives birth exactly at 40 weeks anyways 😂

14 weeks boo im in my second one now

Im due feb 7

both of my apps say i’m in my second trimester and its 13 weeks so idk anymore

@Alicary I’m due Feb 7th as well and I’m 15weeks lol

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