I Had Unprotected Sex Halloween Night And The Next Morning.

I had unprotected sex Halloween night and the next morning. He did ejaculate inside of me each time. I even felt it. The next day I got my period, but I am very irregular so I never know when it's coming. But I ended early then I normally do. It lasted five days instead of 7-8. I have noticed my areola's getting dark and my breast feel fuller and bigger. I am having discharge and fatigue a lot more than ever. Could I be pregnant?