My boyfriend put the tip of his penis on my vaginal opening on feb 5, he did not cum inside of me and I think he pre came in my butt because we did anal before hand, the last time he had came before then was a few hours before and he had peed since then. He came about 5 minutes after he put his tip on my opening. I was not fertile at the time, and I got my period 6 days later...could I be pregnant?