I have been on the patch for 18 months and havent missed any. This month has been very odd for me. My breast do hurt when my period is about to start but I have never had my nipples to hurt which now they do and stay hard. I had yellowish discharge with alittle blood in it. I have been cramping since Tues. and I always start my period the next day after the cramping has started. Certain food smells make me sick and I have on and off stomach sickness. I took a test yesterday and it was - but my period is usually due anywhere from Wed.-Fri. so if I am pregnant then it could be a false. The only thing different is, I took antibiotics and they said i didnt have to use back up. Any idea whats going on?