Whats wrong with my menstrual cycle? Uterine wall shedding for 2 weeks now?

I think I've bleeding stringy (blood clots) black, brown blood for 2 weeks now. This is not normal to me. Usually I shed a little, then a heavy red flow for a couple of days. But this has been going on and never red colored so far. I'm pretty concerned. I think I'm shedding my uterine wall (atleast, that's what I've been told).
I'm 17 and not sexually active. I'm not on birth control. I'm eating normal and my weight hasnt fluctuated. I had my first period when I was 12 so I don't think irregularity is to be ignored.
 
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