About two weeks ago I had reddish brown discharge for one day. I should have been starting my period around that time (I thought I was getting ready to start). A few days later I took a pregnancy test and it came back negative. Its now the 27th and I still haven't had a period. I have had some lower abdominal cramps. I have irregular periods but usually have them the mid month and usually end them no later than around this time (27th). I have no other signs of pregnancy that I can tell (i.e., no tender breasts, no dizzyness, and so on). Any ideas?