I seriously believed until I actually started having one that the period itself lasted for 28 days-not the time that came after it until a new one. Man,that would have been pretty painful!
A childhood belief about periods

others believed things like this
- i used to thought that period is when you pee like a baby for a few days...— i'm totally weird
- 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 believe that eg 1+1=11 and 2+2=22.
Luckily that only lasted until age 2 1/2.— Madi - I used to believe that if you left crumbs out for a long period of time, they would turn into ants.— Bylaberrie
- That you had to marry your sibling. During this period of time I devoliped a crush on my brother.— don't worry I'm a girl
- I used to think all wars lasted only 4 years, like college or something. Anon