I am 26 yrs old,having prolonged menstrual flow (20+days) since menarche 12 yrs old, stops only on taking OCP (earlIer I was on primolut-N n currently on femilon) if I take 1 complete cycle of femilon(21 days) then next 2-3 cycles are regular but 4-5 cycle probably gets too prolonged , this keeps on repeating, ultrasound is normal only hormonal imbalance, I want to know can it be related to thyroid my t3 level was 3.08 nmol/L (while taking femilon) slightly greater, t3 n tsh is normal.pl suggest