My Wife Aroud Fourty .developed Prolonged Period 14+ .her Doctor

My wife aroud fourty .developed prolonged period 14+ .her doctor did pelvic us for her which shoed ET and lntramural fibroid 2.2cm her doctor adviced her to do D\C after the operation and treatment my patient developed heavy menses after she stopped the treatment used to stop menses .what is the causes of bleeding .what i will do for her