Some months have 4 weeks some have 5, but a lunar cycle is 28 days, so we're pregnant for 10 lunar cycles (I think??!). There are 13 lunar cycles a year.

I cant remember all the figures, but when I was nudging 16 weeks I remember being dissapointed to find out that you have to wait until you're 18 weeks to be 4 months pregnant #-o . My theroy was 1 month = 4 weeks so 16 weeks = 4 months pregnant - WRONG!!!! 8-[