You really don't need to think about that, just eat a lot of junk food, drink a lot of soda, eat sweets like there's no tomorrow, don't exercise and drink beer, before you know it your clothes aren't going to fit and you're going to start getting FAT; have a BAD diet and make that sofa your friend; that will do it
I remember one time I asked a lady when was her due date and she told me she wasn't pregnant. I felt comfortable to ask because I knew her. I guess you know how I felt. I was extremely and I mean extremely embarrassed. You can't blame me because she really did look pregnant.
After that experience I don't care if you really are pregnant, I don't ask. You may just be fat and I don't want to go through that again.