Hello thanks for contacting health care magic. Going through your history I find that, you must be having hypothyroidism. not hyperthyroidism. eltroxin which contains levo-thyroxine is used to treat same. you need to be euthyroid before planning for pregnancy. And increase the dose by 25 to 50 % as soon you find that you are pregnant. Modus is to regularise the period not treat the thyroid dysfunction. modus should stopped immmediately as when you know you are preganant. Bye Take care have a good day.