Could I Be Pregnant ?

Hey lovely ladies!
So on the 18th,19th and 24th of this month I had unprotected sex with my boyfriend and  my period is due in 3 days but I've had no PMS symptoms what so ever. I usually get really moody and sore breasts 1 and a half weeks prior to my period as well as cramps but nothing so far. I have a 28-30 day cycle, is it possible that I am pregnant?