When does the third trimester start

Question

I'm 27 weeks today. Does 3rd trimester start today or next week at 28 weeks? All my books say 27 weeks but I've had some people tell me it's 28 weeks

Answer

This is what I have been referring to but I think different ones say different things so I'm not100% sure

Answer

3rd trimester begins at 27 weeks 6 days

Answer

I divide the 40 by 3 (13.333). 40-13 = 27 so I go with that!

Answer

Hope this helps

Answer

Those who say 28 weeks are probably doing the ol'math way of 7×4.

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