I was 4 months late because I have an abnormal period,went to the doctor and the blood and pee test came out negative.t hey did additional test to make sure didn't be my hidden kidney stones and stuff and it was fine. Just got my period last Saturday, and now it's Sunday...it's STILL on with blood clotting, my period usually lasts 6-7 days but this cycle here is abnormal. And reasons why this is happening?