i know exactly what you mean i had this problem the first time i had sex. in fact the guy popped my cherry 2 different times. the first time it just wasn't all the way popped and only bled a little and the next time it bled a lot more.

the hymen is very deep and you probably just didn't go deep enough the first time.. happens all the time and it's nothing to worry about.

remember: use a condom!