I think I cancelled out my bc but I'm not sure if it's possible. I think my DG vitamins and minerals did it I don't wanna give anyone ideas so if it's possible what could have done it because I'm on implanon and it expires in 4 months and my periods have been so light since march 2013 but this last one was heavy and made me crazy and my breast hurt so bad and I'm not going to go out and just buy a test because I'm on bc and I don't use the cheap ones so they are expensive for me but me and my man are very sexually active and because I'm on bc he usually comes in me and I haven't had any problems since 2013, So what's the problem. Please help me.