Implantation bleeding?

I had two cycles of the depo shot three years ago and after stopping I haven’t had a normal cycle. In fact I’ve only had like 3 periods since then and for only a few days.

My OB prescribed Provera to force a bleed and it worked. About the same time Glow predicted ovulation I did have symptoms-

High and soft cervix

Watery cm

One sided cramping

Random episodes of nausea that came on quickly and didn’t last long

Fast forward to today when I wiped I saw this brown discharge. Could it be implantation bleeding? Or is it maybe late ovulation spotting? I’m only on CD18

Ps- apologies for the gross photos but I wanted to be as real as possible. My SO and I aren’t necessarily trying to conceive but would be ecstatic if that were the case!