It can be confusing to calculate dates etc, but remember 1 month isn't 4 weeks!!!, 4 weeks is 28 days, u have remember this when your calculating how far along u are. For example... My last period was 12th june, so if u calculate how far along I am with months = 12june -1month- 12july (- 2 month- ) 12august (-3month-) 12 september 16 days.......... This would mean i'm 3 months 2 weeks and 2 days pregnant right??
Nope, i'm 3 months 3 weeks and 2 days pregnant, because u need to calculate week by week , which would be sunday 12 june, sunday 19 june etc etc, to get an accurate count of how far along u are, because theres a weeks difference, this is the way to docs calculate it any way, and the various tickers, pregnancy calculators etc that u can find online.
I think that might explain why it seems like we carry our babes for 10 months, adding of course the extra week docs add on just to be sure etc.
Anyway hope I explained that easy enough, I took me a while to get my head round it too.
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