Had unprotected sex on april 9 used the withdraw method 4 days later i started having cramps in my lower abdomen lasted 2 days what could it be?

Post sex: cramps: There is always a risk of acquiring a pelvic infection, and the incubation period prior to symptoms in some is about "3-4 days". You did not mention whether your period is due, but of course "cramps" from an ovarian cyst or a period can also be painful. If the pain persists, see your gyn provider for an exam and a vaginal culture.