When my auntie was in hospital having given birth to my cousin (she was in her 20's) she couldn't understand how the woman in the next bed had had a aby when she wasn't married. She had to ask her mother when she came to visit. I'm not sure whether she thought that you couldn't get pregnant until you were married (even if you had sex) or that you were physically unable to have sex until you were married. There is also the possibility that she didn't know which part of being married had got her pregnant but I've never like to ask :-)
A childhood belief about reproduction

others believed things like this
- I used to believe that when you got married you immideatly got pregnant and so I was terrified to get married— leo
- When I was little I used to think that as soon as you were married the woman automatically got pregnant.Anon
- i used to believe nuns were married to jesus and priests were married to mary.— sunshine
- When I was younger I thought that to elope was to run off and get pregnant before you got married.Anon
- I used to believe that women could only get pregnant once they were married and it just sort of happened Anon
- When I was younger I used to believe that women just magically got pregnant after getting married.Anon