Suggest Treatment Unusual Vaginal Bleeding In Between The Menstruation Cycle

hi doctor..actually am having unwanted vaginal bleeding from so many days..its not my regular period also.one week it ill be there and one week itwont be..again next week it vl start..am a married girl and when my bleeding stops we have intercorse also..i dont knw the reason why its happening sir..plz giveme any suggestion orprescribe me any medicine sir..