When does the first trimester end 12 weeks or 13 weeks?

Question

Answer

Second trimester begins at 14 weeks.
So the first trimester ends at 13 weeks.

Answer

40 weeks of pregnancy / 3 trimesters = 13.333333 weeks a trimester. So 13 weeks and 2.33 (let’s call it 3) days really would make you in your second trimester. 26 weeks and 4.66 (let’s call it 5) days would put you in your third trimester. ❤️

Answer

My sisters are labor and delivery nurses and both had babies in the past year, and they told me the first trimester is through week 12, meaning the second trimester starts the day you turn 13 weeks. The second trimester lasts through week 26 and the third trimester begins the day you turn 27 weeks.

Answer

It ends once you’re 14 weeks

Answer

14 weeks per my medical coding books. I go by that since I see it all day and it’s what’s engrained in my head.

Answer

End of 12th week. 13 is a new month and the 4th month so second trimester.  Different apps say different things...I go by common sense lol 4 weeks in a month. First trimester was 3 months. You can go by either it really makes no difference 🤷🏼‍♀️

When does the first trimester end 12 weeks or 13 weeks?

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