i've had a dark brown discharge for about 4 days now and im not sure what it means? im suppose to get my period in a week and im on birth control but havent missed any days. i have not been sexually active in a really long time so i know that im not pregnant. i have had a slight pain that feels like cramps althrough i never cramp this soon before my period. any ideas of what it could be? and if its something i should worry about?