My period has always been pretty regular, I was on birth control for about 2 years, I got off at the end of my freshman year of college, I am now a sophomore. My boyfriend & I had unprotected sex on May 13th, & May 14th. (he used the pull out method") I ovulated on May 14th. my period is due to come on May 28th. but I started having dull cramps on May 21st. I never get cramps before my period is due to start. Even when I go to the bathroom to pee there is no sign of blood at all. I've been having headaches, & I know this may sound weird but only 1 of my nipples has been hurting lol. I'm just trying to figure out what's going on!