I used to believe that once you "did it" you could get pregnant for life at anytime...also if you washed a boys underpants with a girls, you could get pregnant.
A childhood belief about getting pregnant

others believed things like this
- I used to believe all babies came out as girls and later on in life some of those girls turned into boys — Tom
- i used to believe you could get pregnant from swimming with boys.Anon
- I used to think that girls get pregnant by seeing manAnon
- I used to believe that all girls one day just became pregnant. Like at some magical age it just happened.— niki
- I used to think you had to put it in a girls belly button to get them pregnant.Anon
- i used to believe if you touched a girls knickers she would get pregnant Anon