[ Women's Health ] Open Question : is this normal? (menstral question)?

so i'm on my first pack of birth control. it's a 3month pack. and two weeks before the sugar pills i started getting brown discharge and a week later, it turned into a brownish red. it's VERY light, not like a normal period. and it's still a week before i'm suppose to get my period. is this normal? i also have really bad cramping. please, let me know..