I had my mirena inserted a little over a month ago. For the first week or two, I had unbearable cramps followed by my period. My period started off great- no cramps, super light. Then it hit. I bled for almost two weeks straight, and now I am having a brown discharge. I ve had the discharge for a little over a week. Sometimes, the brown discharge can be accompanied by spotting (my actual period blood). What is causing this brown discharge?