i had my period last month like usual during the placebo pills around the 10 of december and it last for around 5 days which is the usual. but then i got my period again on the 26th, 2 weeks before my next week of placebo pills. technically i wasnt supposed to get my period until yesterday or today. on top of that, what started on the 26th, still hasnt stopped. until today i still have my period. but its not been like a regular period, its been mostly black discharge. i kept on taking my birth control like usual though. and yesterday was the first day of the placebo pills. what could be wrong with me? could i be pregnant? please help.