I had sex in May it was protected the guy wore a condom and i am on birth control. My period came that month but it was short. Now June my period also came but it seem different. I had small spots on the pad sometimes none at all but when i wiped there was a lot of blood on the toilet paper. It been two days since i had my period and my right lower back side is hurting and my breast are swollen and my nipples are red and sore. Can someone tell me if something is wrong? Am i pregnant