Spotting

Kels • 23, married to my best hunky friend!
Hi! I had a miscarriage at 8wks December 13, had a normal period 30 days later. On February 11 I started having brown spitting. I never got a period and still haven't, and am still sporting brown. I had a negative test about two weeks after it began, hormone labs came back normal, and my pap/ultrasound checkup in November was all normal. 
Have any of you experienced spotting for this long? I have no other symptoms, pain or anything. Should I test again? So frustrating 🙄