When is the first trimester over?

Question

I think thought it was 12 weeks but not certain.

Answer

It ends at the end of 12 weeks.

Answer

I read somewhere it technically starts at 13 weeks 3 days!

Answer

im 12w6d and it says im in my second trimester on this app

Answer

ive been confused over this too. because some things that ive read say that 13 weeks begins the 2nd trimester and others say 14 weeks begins the 2nd trimester. but natural consensus says that 13 weeks begins 2nd tri!

When is the first trimester over?

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