When I was 5 or 6, I overheard my mom talking on the phone and she said that one of her friends was on her period. I didn't know what that was, so i just thought it had something to do with punctuation. I never thought about it that much, and I never figured out what a "period" was, other than punctuation, until I actually had my first period. It changed.
A childhood belief about periods

others believed things like this
- In 6th grade, I thought that once you got your period, you'd have it forever!!!! 24/7Anon
- I thought that your period came out all at once and you had to wear a pad around the time it would come.— Sarah
- i used to thought that period is when you pee like a baby for a few days...— i'm totally weird
- My mom told my sister that if she didn't eat her peas, her period would last for an entire month.— Maya
- When my brother would go by condoms i thought that guys had period and that is what they usedAnon
- When I was a kid, I found out about a womans period and I thought that she would bleed through her breasts.— Michael