What Causes Brown Vaginal Discharge After A Miscarriage?

i had a miscariage 7 weeks ago, i had what i think is a normal period 4 weeks later blood was brighter red than ususal but i didnt think anything of it.and everything seemed fine. about 9 days after my period i started spotting pink discharge which led to a brown discharge only when i wipe is this normal after a misacariage.