My parents never told me that people had sex to have a baby, they just said it was when a man and a woman decided together that it was the right time.
So until I was 11 or so, I thought that a woman would only get pregnent when she decided in her mind that it was time. Sometimes I'd freak myself out by "thinking" I wanted a baby, and would then knock on wood 3 times.
A childhood belief about getting pregnant

others believed things like this
- I used to think that if a black woman or man and a white woman or man had a baby, it would be Asian.Anon
- I thought that if a black man and a white woman (or reverse) had a baby it would be stripped!— Bec
- When I was younger I thought that when a woman was pregnant she would feed her baby through her belly button!— Hennie
- That to make a baby a man (over 21 & under 25) had to kiss a woman (over 19 & under 21).— Johny
- I used to believe that a baby's sex was determined by whether the sperm had a picture of a man or woman on it.— David E.
- I used to think that to give birth, a woman had a slit cut into her inner thigh, and the baby would come out.Anon