bleeding while ovulating?

Ashton • Hyperthyroidism
My app told me I'd be ovulating Saturday and I did. And the next day it's like black blood off and on for days. This isn't like a cycle but it's like very very little amount of dark blood. Does this usually happen when you're ovulating? It's not implantation bleeding is it? That'd be too quick and isn't that dark right? I just haven't been sure how to log this.