Anyone get a dark brown colour when wiping their vagina after getting the birth control shot?

Hey everyone.

So I got my shot a week ago for birth control. And I noticed yesterday that when I wipe, there is a dark brown colour. It doesnt smell, it doesn't come out as a discharge. It is only after I pee.

I should add that I just switched from the copper IUD to this after 6 years.

Should I get it checked or is this normal with others??