I had sex on May 16th twice with my boyfriend unprotected and no birth control. My expected period was that same day on the 16th but due to the fact that my periods are irregular sometimes it ended up coming on the 19th that month. I kept having cramping and at first I thought it was normal but it's been over a week after my period and the cramping hasn't stopped , its very uncomfortable . Whats the possibility I'm pregnant ??