not sure i understand your post.
was the condom covering the head of your penis when you withdrew?
that i dont know thats why i am confused
can a condom slip inside the vagina?
did YOU take the condom off after sex? was it on your penis or not?
ok...looks like we're gonna play "20 questions"
was the condom hanging out of her vagina?
reason is...IF the condom was hanging out of her vagina...the condom more than likely came off during withdrawal, in which case your penis would have been protected.
was the condom up in her vagina?
if the condom came off during intercourse...you had "unprotected" sex and will need to test.