I'm in the process of a medically managed miscarriage, i was given misoprostol yesterday. i have just had black/diarrhoea. is that normal?

Diarrhea w/Cytotec: Misoprostol may cause mild to moderate diarrhea, stomach cramps, and/or nausea. These problems usually occur during the first few weeks of treatment, subsiding after about a week. The occurrence of diarrhea may be minimized by taking misoprostol with food. Black stool however raises the possibility of GI bleeding--any symptoms to so suggest?