When I first got my period at 13, I didn't know anything about the female reproductive system. When I started passing clots of blood (pieces of uterine lining) with my period, I thought they were pieces of the baby that I would have had if I'd had sex. I'd look at it and try to figure out if it would have been an arm or a leg or something.
A childhood belief about periods

others believed things like this
- I used to believe period blood came from the nipples. I thought that was what "padded bras" were for!!Anon
- HA! I used to think when you got your period, you would just pee blood...I wish it was like that...if only.Anon
- i used to thought that period is when you pee like a baby for a few days...— i'm totally weird
- I used to believe that the babys born in the back part of your body and not in the reproductive system.Anon
- I thought the airport was a place that you get chopped into pieces in order to go to outer space! lol!!!— I don't know why you get chopped...
- I used to believe that comets were pieces of the Sun that had broken off.— Carmen