period for 2 weeks? what do i do?

i’ve had my period for a long two weeks. my period has never been this long. i’ve always had regular periods at regular times. my periods stared to get a little crazy these past two months. the month before this it felt like i had my period every other week. i started this period on the 14th. it’s now the 29th and i’m still going. i’m on birth control, the pill, i take it regularly at the same time every night. maybe that’s what’s causing it? i’m not sure. help me out!!