New discharge since Mirena

Hello. I got mirena back in late May. Since then, I've had some spotting and pretty bad cramping. Now, a new symptom has started that has me a little worried. I have this thick brown discharge (like thick brown boogers) along with spotting. It smells, but only if I deliberately sniff it. It mostly just looks gross and is a pain to get out of panties. Is this from the mirena? I'm not sexually active, and had no stds at the time of insertion. I do worry about future partners seeing it and being grossed out. Anyone else experience this? Tweet