What week is considered 2nd trimester?

Question

Ive heard a lot of people say its 13 weeks but almost every online "calendar" of pregnancy says week 14 is 2nd trimester???

Answer

40 ÷ 3 = 13.3
Some round down. Some round up.

Answer

Week 14 starts the 2nd tri just as this chart shows

Answer

It’s always been 13 weeks here.

Answer

My OB told me the start of 13 weeks is second. Googlegives you multiple answers, so I’m just sticking with what she said.

Answer

I’ve always heard end on 13th week

Answer

I believe this chart is correct because I just asked my doc when 3rd trim is and he said 28& this says 28 lol

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