Suggest Remedy For Brown Discharge And Cramps Along Belly Button

I'm 22 years old. I didn't start having a "normal" period until I was 18. Even then it was 2-3 months in between each one. But that was my normal. Recently I had a miscarriage. About 4 months ago on July 2nd. I had a feeling I was pregnant but i had 7 neg tests for weeks and one positive one finally on July 1st. I have O-neg blood and my husband has O-pos so my antibodies thought my baby was a sickness. I got a Rhogam shot so that wouldn't happen again. I just had my period recently on October 24th(almost 4 months later) and lasted 8 days. Today I started having a brown discharge. I had that the night before my miscarriage and I'm worried because the last couple of days I had sudden short intense cramps along my bellybutton. Im wondering if this is just leftover tissue or if I should make an appointment for the OB-GYN. I dont want to miscarry again but I dont think Im pregnant either although I wouldnt rule it out completely.