It would be better if you learned this now so you won’t be surprised when you have this discussion in about week 38 when you get a lecture on the big trick played on women: pregnancy is even longer than they were told!
Pregnancy can last 42 weeks, which depending on how you count your months, might sound like ten and half months! And in those last few weeks, they will be dying to get the baby out of their body like Linda Blair in The Exorcist.