Brown coffe ground like discharge 5 weeks 4 days. Tmi!!

So i went into the er yesterday because i was having a terrible back ache around my tailbone area and having some dark brown discharge. Er said my hcg levels were 3000 which was good she said. Now im having some mild cramps around pelvic area and my discharge looks like dark blackish brown with some small tiny tissue clots. Should i assume miscarriage is happening?