This is such a timely question! I’ve often wondered about the same thing, especially after having three kids of my own. Then, the other night I was flipping through channels and came across a show called “I Didn’t Know I was Pregnant” or something like that. I think it was on The Learning Channel.
Anyway, the show was about this young woman who had heart problems and was told having a baby would be too dangerous. She was on the pill, and only got her period every few months. She jogged, wore a bikini to the local pool, and gained about 10 pounds without really noticing. No sickness, and she still got her period every now and then. One night she woke up with horrible stomach pains, told her boyfriend she was going to the hospital, and passed out on the way to her car. Luckily a neighbor saw her and called an ambulace. The EMTS were examining her and saw that her pants were all wet. They took a closer look, and the baby was crowning. This girl had a baby while unconscious—she never even knew whe was pregnant. They boyfriend came running up just as the baby was born. The baby was 10 weeks early and only weighed 3 pounds, so I guess the kicking in the womb could have gone unnoticed or been shrugged off as gas.
The mom woke up in the ambulance and thought she’d been in a car accident. The baby had to spend a few weeks in the hospital, but otherwise turned out OK.