I know it only adds up to 39, but I always counted 13 weeks in each trimester. At least that gives you 26 weeks in 6 months (as 26 is half of 52). Anyway, you could easily be pregnant for 42 weeks - you're not technically overdue until you're two weeks past your EDD. So that would make each trimester 14 weeks long... now my head is starting to hurt!

I always counted my pregnancy by week..i.e at 24 weeks, I counted myself as six months pregnant..I know there are extra weeks in there, but it always helped me especially when reading the baby development books that count everything at weeks!1

Congrats

Your 24 weeks pregnant

Don't forget that pregnancy 'weeks' are counted from the first day of your last period (assuming you have a normal cycle). So, at the moment of conception, you are two weeks pregnant. You can never actually be one week pregnant - unless you count the end of your period!

Also, most months are 4 and a half weeks - four weeks is 28 days, so you usually pick up 2 or 3 days each month - this add up to the extra two weeks. That's why babies are considered full term after 38 weeks.

So, as far as I can work out, you would have been pregnant for six months at about 28 weeks - is that right? 26 weeks in 6 months (half a year) plus two weeks at the beginning.

That leaves another 12 weeks (or three months) to get to week 40.

Does that sound right to others?