What Causes Brownish Vaginal Discharge With History Of Miscarriage?

Hi, i am 22. I had a miscarriage almost 4 months ago and i bled for a good 5-6 weeks. I then got my period on the 16th of march and this lasted around four days. Then around a week later i started having brownish discharge which has not stopped for the past three weeks. Sometimes its darker in colour than other times. Is this normal? Or is there a possibility i have gotten pregnant again and this is another miscarriage?