Odd question but hoping for some insight

Katrina
So basically I had my second miscarriage this past November, I was about ten weeks along and needed a d & c. Since then my periods have been regular, after waiting about for months to get it back, since then about halfway through my cycle so like two weeks after my last period and like two weeks before my next, I'll get really dark discharge like a brownish color. This month it almost looked black. I know it's old blood I can tell by looking at it. I guess my question is if anyone has experienced something similar? It's actually quite annoying.