I used to believe that if you went swimming after you got your first period, then you could get pregnant.
A childhood belief about getting pregnant

others believed things like this
- i used to believe you could get pregnant from swimming with boys.Anon
- I used to believe that you had to be on your period to get pregnant........— Tricia
- I used to think that when you swimming 'Freestyle' was swimming any way you want.Anon
- When I was little I used to think that my mom was a mermaid because she never went swimming with me— Martina
- I used to think that the pools was a swimming competition.— Matt
- If you eat 30 minutes before swimming, you will sink.Anon