When does the first trimester end?🤔

Question

Im not totally sure because some people say 12 weeks, some people say 13 weeks, and some people say later. What do you ladies think?

Answer

My dr says 12 weeks. I know other drs say 13 weeks 🤷🏻‍♀️

Answer

Second trimester starts at week 14.

Answer

The last day of the first trimester is 13+3, so the last week is considered week 13. The first week of the second trimester is week 14