Verified answer

They didn't. Even pulling out was considered a sin, but i'm sure some people did that too.

Women also used douches with vinegar to kill sperm inside the vagina and cervix, but this is not guaranteed, since the douche does not get into the uterus and sperm in there can still survive.

a friend of mine knows her cycle so well she knows when not ot have sex and when she can and the both times she has tried she got pregnant the first month so she is pretty fertal but she knows when she ovulates and just doesn't have sex then its worked for her for 11 years