Once your thyroid is fixed and as long as there isn't anything else going wrong, your normal cycle should emerge a few months after you go off of the pill. For some people it will happen right away, but others seem to take a little while to readjust. You may ask your doctors how soon they would recommend trying after you stop the pill. I think I have heard that it is a good idea to wait three months after the pill to attempt to conceive.
Total abdominal hysterectomy at age 26 due to abnormal bleeding. Kept ovaries.