The first day of my last period was 3/1/10. I had a couple dizzy spells last wk but I didn't think anything of it until 3/29/10. That night I started having horrible abdominal pain and when I sat on the toilet and pushed bright red blood started dripping. The cramping pain was pretty intense. The cramping stopped after a full day but the blood is really bright red and heavy, but my period was also due to come between the 29th and the 1st. Could this be a miscarriage or just a bad period?