Warning, this is TMI.. I just need to know if I should go see my OB.
My son was born Oct 18.
My first PP period started Dec 4th. I started the NuvaRing on Dec 5th. My actual period (with red blood) ended Dec. 10th. It's now Dec. 14th. Ever since my period ended, I've been having this REALLY gross mud-colored discharge. It's not very heavy. It's just NASTY.
Sounds like your uterus is cleaning itself out. It's normal, the brown and mud colored as you described is just old blood and lining filtering itself out.
I haven't used a nuvaring. Erm let me think. I stopped bleeding about 3 weeks PP and that stuff came out of me til about 6 weeks PP, but I had an infection and got treated then so that may be why it stopped.