I don't know what's going on. My periods are always regular. They start at the same time, they start out heavy and last a week. Always. Well it's 5 days late now. I took a test yesterday and negative. Then last night I had some old brown blood so I though maybe my period was coming finally. This morning I had a little pink discharge. Then nothing. No sign of period. No symptoms. I've never had this happen. Could I be pregnant even if I had a negative with my period past due?