Suggest Treatment For Intermenstrual Bleeding

i have been taking Crisanta LS Drospirenone and Ethinylestradiol 24 FROM LAST 6 MONTHS.IN OCTOBER MONTH I HAD BLEEDING BCOZ I HAVE TAKEN OVER DOSGE OF MRDICINE. NOVEMBER MONTH IS REGULAR.BUT NOW IN THIS MONTH I FOUND THERE IS SOME BLEEDING BEFORE MY MANSTRUAL CYCLE?WT SHOULD I DO?CAN U PLZ HELP ME?THANX