Go to the ER, ASAP it could be a miscarriage
It may just be dried up blood. Whatever was supposed to be your period..this happened to me too at around 6 weeks as well.. as long as you're not experience sever cramping, having discharge that is bright red/ foul smelling or itching, you shouldn't be too concerned. But you may want to talk about it with your midwife/doctor just to make sure.
Are you experiencing cramps