i've had my period for two weeks today?!

[angiecxo]

hi!
so i started birth control on october 2nd, on the day i got my period. i'm on alesse 28 and today, two weeks later, i still have my period.
i'm really paranoid about it.
my boyfriend and i had sex before i was on the pill, unprotected.
i don't know what it could be so i'm dying for some help.
my period was normal, and went away for about a day but then it came back kinda brown, but starting yesterday its red again.
what is it?