Im a nineteen year old virgin ,I've never had a normal menstrual cycle,so i started dating my first boyfriend about two months ago ,and we have been playing with each other sexually (masturbating) nothing more,but on the 2nd december ,it went a little far cause the head of his thing was almost inside me and there was pre cum,i stopped him in but till today i still havent got my period ,could i be pregnant,or is it one of my normal skipping my months,please advice