32 weeks = 8 months. Pregnant math...

I am 32 weeks now. That's 8 months. But the ticker below shows you that I have 8 weeks left. Why does that sound wrong? Because you're actually pregnant 10 months vs. the 9 months we speak of. 40 weeks vs. 36 expected. It's a bizarre system of counting. Firstly, you count the 2 weeks between your last period and conception where you aren't really even pregnant yet. Then I guess they tag another 2 weeks on at the end. So you're probably truly pregnant for a full 38 weeks. More useless trivia...