what happened about ten times? You having unprotected sex? Be careful doing that if you dont want to be a father yet...If they were spaced out throughout a month then there's a good possibility she is pregnant. Not saying she is, but there is a chance. Is she late or something? Why are you asking?
shes not on birth control and it happened maybe about 10 times
I would say if she was really close to her period (before or after) there's a less if a chance. But if its like right in the middle..you may be in trouble. And I am proof that the pullout method DOES NOT work :) Good luck!
Depending on the girls cycle, the odds could be very good. If she is not on birth control the odds are even better.