Man, look at the good threads I miss while I'm in meetings... must win the lottery so I can spend all day on Derbytrail....
I agree with the others, though I've never been pregnant. If a woman isn't trying to get pregnant, depending on her body, she might not realize it for a while.
I had a friend, also 95 pounds soaking wet when she was a teenager, who got pregnant and was so terrified to tell her family she kept it a secret for the entire term-- a picture of her two days before she gave birth showed what looked like a small beer belly. No lie, she gave birth BY HERSELF, in her bedroom, and only afterwards called her twin sister in to see what had happened.