My girlfriend and I had sex around December 1-3, we were first grinding while fully clothed, i did not ejaculate while we were doing so, i then rolled over and put on a condom the correct way before rolling it onto the bad of my penis. We then had sex and it did not end in ejaculation. I kept the condom on until he went to the bathroom, only then i removed the condom and filled it with water to check for leaks or tears, which there were none. The following week She had her period. Is there a chance of pregnancy because of the act alone, and by receiving her period that means Shes not pregnant?