Suggest Remedy For Delayed Periods

Hello Doctor, i am 31 years old mother of 2 sons 5 and 3. In the month of March 1 2011 i had tubectomy, after my tubectomy i had spotting for 2 months and did not had periods. Again in the month May i consulted my Dr. for spotting and my periods. she gave some hormone tablet(zocon-T), infection tablet(Azibart-250) and tablet(Modun-10) for my periods, she said; once you finish this tablet u will have periods in 3rd day, but today is 7th day i still did not get my periods. wht should i do iam very worried.