I think it's around 26-28 weeks depending on where you look. In my day to day pregnancy book, I am already in the 3rd trimester! It started at the 26th week so 25+1. On here it's 27 weeks; not sure if that means once you hit 27 weeks or the 27th week which is 26+1!
Anyway, I'm bobbing back and forth between the two now and will probably completely move over at 27 weeks.
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