So I have been on birth control since may 2012. I had my wisdom teeth out on July 17th and was on antibiotics for a month and a half. I don't remember getting my period in August. I spotted once a very little bit in September and I didn't get it in October either. At the end of October I was put on antibiotics for lymes disease. I also took two home pregnancy tests and they were both negative. My boyfriend usually starts off inside me without a condom and then puts one on before he ejaculates. Lately my nipples have been very sore. Could it be hormones causing them to hurt or could I be pregnant?