Earlier in the month I had some lower abdominal pain, I'm not sure if it's related. My period is always roughly 28.5 days apart and lasts a maximum of six day, but was at least 3 days late. Today is the fifth day but I'm still having a significant amount of fresh blood, whereas normally by now I would be having a small amount of brownish almost mucousy discharge. I started having abdominal and lower back pain today, I normally have very little pain and never this late. I have had a few clots, not really big, but definitely bigger than anything I normally have. Is this anything to be worried about or is it just an extra heavy period?