I am 36 years old. I am suffering from hypothyroidism. I take 100 mg tablet. My menstruation period is of 25 days normally. I have inserted multi load. I am using it from 2006 after my son's birth. It was a forceps delivery. But in this month bleeding started on 17th day from previous menstruation cycle. But from 17th to 22nd it was not continuous but only when I used toilet, and it was a little heavy means flowing like. And from 23rd day it was like normal menstruation cycle but it bleeds heavily. And now on 6th day also bleeding hasn't stopped yet. What should I do? If I need any medical treatment?