My boyfriend and I had unprotected sex on the 12th of September, he pulled out.. Then on the 14th of september he put it in unprotected but he we did not have sex all the way unprotected. On the 15th we had sex and it was protected. 6 days later i get my period.Usually i get really bad cramps but i have not gotten bad cramps, and my flow is not heavy at all as it should be.. It is lasting the normal length of how long my period usually flows however. Could i still be pregnant?!