What To Do If Hyperthyroid Medication Does Not Help Irregular Periods?

Hi I have been trying to have a baby and I noticed that my periods started becoming irregular.on a visit to doctor,she insisted that I have gained weight and it could be because if hyper thyroid.(my earlier tests indicated I had a higher levels of thyroid hormones than normal).I took evecare for almost two months to get my periods straightened. It isn t helping.can you please help me what could be the problem?bhatvinutha02