My period should have ended on Sunday, it's Friday and it's still going strong with heavy clots. I drank alcohol once during the period so I figured there'd be some irregularities but this is longer than I had expected. At first I was just spotting but then it was like my period started over. I was also really sick over the weekend with extreme stomach pain which was because i had taken too much of a medicine but I already went to the doctor and that has been taken care of but my period is still going. Should I be worried?