I have irregular periods because of pcos. It means period comes 3 months once and occurs heavy bleeding. Two months onwards I am taking metformin 250 mg 2tablets and thyroxine 25 mg daily early mrng and calcium and folic acid tablet. On jan 7th my period on march 20th doctor suggested me to take norethisterone tablet 3 days then stop it. I can do like only after 5 days I have periods on march 25th to april 1st. How much time can I wait for my periods. If my periods didn't come on may 1st what can I do .i am taking metformin now. I want to be pregnant weight 59 kgs 5 feet 5 inches. Age 27.