Super brown blood while on placebo pills while also on Nexplanon

Does this look normal? This is my first time having a “period” back since I have stopped my periods on the Nexplanon 4 months ago.

I’m still cramping very badly but only getting this brown blood and spotting.

I never had it before when I was on the combo pill. But then again, I’ve never missed a period for so long before getting on the Nexplanon either