Okay so my last period started Jan. 29 and ended Feb. 3 I had sex unprotected on a I WASN'T ovulating and my period is two days late. I know they say that sex can throw your period off by one or two days and yesterday I was cramping, but it was off and on. My boyfriend says that I have nothing to worry about and that I should be calm, but I can't especially when I'm not ready to have a baby.