I was in Grade 7 and we were learning about internal injuries in our First Aid Class. The symptoms were:
Headache
Persistent pain in the abdomen that does not go away
Vomiting/vomiting blood
Passing blood (Like when you pee)
A day later, I woke up with a headache and stomachache, they didn't go away. When I went to school, the stomachache got so bad that I threw up, so I had to go to the nurse. I found some blood in my underwear and in the toilet. So I was convinced I had like punctured my stomach or something and told the nurse so. Except then she told me I got my period. Huh. Imagine that. And the worst part is that I knew everything about getting your period, so it's not like I was clueless or anything.
A childhood belief about periods

others believed things like this
- 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 believe period blood came from the nipples. I thought that was what "padded bras" were for!!Anon
- when I was young, I heard that blood had iron in it. I thought blood was red because it was rusty.— Hunter
- I used to believe that guns shot out blood because everytime somebody shot a gun in a movie you saw blood.Anon
- We were always told that if we drank vinegar our blood would dry up— Mike B. London
- I used to believe that salt would dry up all of my blood because my mother told me so.— Charlotte H