People who think that a normal pregnancy is ten months can't count. That or they don't understand that no matter how the doctors and books choose to count it, you are not actually pregnant until sperm meets egg. To prove my point, let me explain how I calculated my due date:
Date of Conception + 9 Months - 1 Week = D-Day
Now, I'm not counting going past your due date, but since they induce at two weeks past your due date, the most you could be pregnant is nine and a half months. Okay, I'm glad I got that off my chest. By the way, I suck at math.