Brown Discharge Randomly at 8W PP TMI

Olivia • 22 years old, single momma 👣 Dominic A. was born April 28, 2016 👶🏼
I'm currently 8 1/2 weeks Postpartum, and I stopped bleeding completely at about 5 weeks. I was checked by my midwife and was told I'm completely healed and clear for all "Activities". I haven't had sex in a couple days, and I was at home relaxing all day yesterday and today. Well this morning I found a little bit of brown discharge, and I have no idea why. I haven't had any cramping, no changes in diet/activity, no medication that I'm taking or anything different at all. Has anyone else experienced this or know why this might of happened?