weakness and vaginal bleeding... help me please.

i am on day 6 of my first cleanse. I was feeling very weak for the past few days. a bit better now. I'm not due to start my period for over a week but now i have a dark red vaginal discharge, similar to the end of a period. i'm wondering if this is just my body trying to clean itself or if there is a problem. im on birth control. i use the Nuvaring. Im also worried about being able to work while on the cleanse. i work long hours in a fast paced restaurant. everyone has said they feel as though they have so much energy but im not feeling that way at all. i have had digestive problems in the past which is why i began the cleanse. i was hoping to stay on it for a while but now i am thinking of stopping after the 10 days. is it safe to continue or should i end it, visit a doctor and try again later?