I got my normal period and I had sore breasts before my period that went but it started again and I have really sore nipples and my breasts are tender and slight nausea through the day! I'm on BC my second month and I never got sore breasts mid cycle. I just finished my first week of pills in my pack.. What's going on with me? I stopped taking my birth control(pill) for a few weeks and still had unprotected sex and I still got my period. I continued them again after I got my period got my period.