bleeding while on BC

Janee • 1 Fur baby 🐶 Full time stepmomma to a little girl 👧 Married 03/23/2018 💍TTC but also working towards adopting

I've started again on birth control for less than a month now but today I have dark red blood discharge. It shouldn't be the start of a period because I haven't skipped any days. Has anyone had this happen before? I'll try to keep y'all updated.