How far does the sperm have to go into the vagina for a women to get pregnant?

Monday, November 30th, 2009 at 12:48 am

So my boyfriend just left the house…
we started to blah blah blah we didnt have sex- no. i wont do that with him for a while. but anywho, he came. and i think some got in my pants a little. like i dont know if it went up there, but how far does the sperm have to go into the vagina for a women to get pregnant?