Hi Sir I Have Irregular Periods, After Marriage First Month

Hi sir i have irregular periods, after marriage first month i got my periods and second time i got after 60 days (Aug 8th.. now i haven't get my periods. i did pregnancy test but it was negative so my doctor advice me to take meprate for 5 days( twice a day). i dosage got over and its about a week i haven't get my periods but yesterday lite brown discharge happened. and today morning very little flow i had after that its normal. pls advice