How long does your period last?

k im on birth control and i have to take it at the same time evry day but i kept forgetting couse i moved from oregon to oklahoma(different time zones) anyways i thought i started spotting but then realized i was on my period ive been on it for a whole week now and its pretty heavy still. im freaked out because ur not supposed to be on ur period wen u take b control untill the pack is empty. what should i do and if this has happened to any one plz tell me no and tell me wat u did.