When Does 1st Trimester End

4 Replies
me - October 25

Does 1st trimester end at the end of the 12th week, end of 13th week or end of 14th week based on a 40 week pregnancy?

 

Lisa - October 25

I am wondering the same thing. It depends on what book you read.

 

Tess - October 25

1st trimester ends on the 13th wk but most says 12th wk. Hope that helps.

 

Jessica - October 25

It ends at 13 weeks. You enter the second trimester when you are 13 weeks and one day. I know it is confusing but you will get the hang of it!

 

me - October 25

Thanks! How much do chances of miscarriage decrease once you are 13 weeks 1 day?

 

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