Could I be pregnant and are these twinges normal at this time?

Hi i'm an 18 year old currently studying in university, my last period started on the 7th of may i had yesterday unprotected (how silly i was i know). About 2 hours after ual i started feeling little twinges in the bottom right hand side of my tummy, I may just be being paranoid but I would be really appreciative if anybody could tell me what the chances are, whether it is very high or whether I have gone past ovulation and the egg may be dead by now?, I still have these twinges today but i am not too sure when ovulation and when the egg will still be fertile for any advice please? Thank you very much