my last period was dec.29. the 1st week of january I took penicillin for a urinary tract infection.. (I'm also on ortho-tri cylen lo birth control) the next week I had menstrual like cramps and blood tinged clear discharge for about two days.. and I've had tingling sore breasts for about two weeks.. today is jan. 21 (three days before my next period) and I'm cramping and spotting brown and my breasts are hurting really bad.. I've took two pregnancy tests.. could I be pregnant or could the penicillin have messed up my pills and my hormones? I'm confused.. can someone tell me what might be going on? I've had two babies and the only time my breasts have ever hurt this bad was when I was pregnant...