Brown discharge instead of a period?

Sa

Hey everyone, I've had Jaydess/Skyla for about 10 months. I recently had got pregnant and had an early miscarriage with Jaydess still perfectly in place! This will be my second period after my miscarriage. Instead of my period...I'm getting thick brown discharge for the past 2 days and usually not enough to really show much on a pad. My periods on the IUD are light but not usually this light. It started exactly when my period should have started and I got period cramps with it. Other than that, I don't have tender breasts like I always do around my period. I guess I'm just freaking out wondering if this is implantation bleeding. I don't want the same thing to happen again (although I've been extremely careful and hardly do anything sexual since the miscarriage). Sorry for the long post... I'm wondering if any of you get a dark brown discharge instead of your period?