Hi Me And My Boyfriend Had An Unprotected Sex. And

Hi me and my boyfriend had an unprotected sex. And I took ipill unwanted 72 within 2 hours of having sex. And I got my periods after 5 days of having sex. And now its 5 days up then my last periods. I got periods on 5th of June and I had sex on 31st of may. And now I didn't come in periods. What is the problem. Am I pregnant. ? Can u please help me.?