I used to believe that the egg that a woman shed during her period would be visible to her and that way she would know that she wasn't pregnant.
A childhood belief about periods

others believed things like this
- I used to believe that you had to be on your period to get pregnant........— Tricia
- I used to believe that if you went swimming after you got your first period, then you could get pregnant. — Mel
- My sister just recently realized that the lyric "more than a woman" wasn't 4 letter woman!— Anne
- I was horrified when my first period arrived. It wasn't blue, like in the commercials for sanitary towels.— Jane
- When I was little I used to think that as soon as you were married the woman automatically got pregnant.Anon
- Whwn I was like 8 I used to believe woman just got pregnant randomly. Anon