asking a very silly/embarraing question.... (TMI)

[SarahMc]

DP and I are wanting to start trying to conceive in October and we have recently gone back on to using Condoms as our main contraception. However we havent been 100% careful, For most of the BDing we havent been using the protection till the end.

So here is my embarrassing question.....

How possible is it to get pregnant from using the protection only at the end? ie whats the chance that pre-cum could get you pregnant?

Forgot to add I was Ovulating at the time!