I'm 23 years old. My boyfriend and I had sex on November 13th. He says he didn't come close to finishing and he is a diabetic. We did not use birth control. I then got my period on the 1st of December. It was a normal period with stomach cramps. I am however late for my next period. It is now 15th January 2015 and I haven't gotten my period yet. Can I be pregnant?