Hi,

I think it may be an american thing. Cos i receive an american email every week of my pregnancy and this week is my 24th week and it said "Welcome to the 3rd trimester" and everywehre else says the start of your 27th week is your 3rd trimester. Thats a big gap to have.

So i would say what you have read that says different to what you thought is the american guides.