Sore breast, abdominal cramps, On Birth control pill not yet time for period!

Hi, my name is Scarlett, Me and my boyfriend had unprotected sex before i started birth control pill. He always pulled out before he comes... Now its my first time starting Birth control pills. After the first week of using the birth control pills, My breast started to hurt like at the end of that first week of me using it. I know you can't have unprotected sex until you have been on birth control for a whole week. ( I cant use CONDOMS i'm alergic to them. So our only method was pulling out.) After the end of week, i started feeling cramps and my breast started hurting, i barely can get up.. I usually don't start having cramps until my period is about to come. ( wich is like 2 - 3 days later before  i get my period )  But my period isnt until like another week and a half!! my periods always comes late. like up to a week late. But i already starting to have cramps and my breast hurts really bad!!! Can somone please tell me whats going on?? is it sign of pregnancy??