Cramps and Depo shot

I’m up for my 3rd depo shot this Tuesday. So i’m at the end of the 3 months and during this im usually spotting a little bit of brown blood. This time however I’m cramping and having light pink blood and brown spotting. It’s not a constant flow like a period. Just red and brown gross spotting.

I haven’t had a period since getting the shot 6 months ago. Has anyone else had this happen? I know irregular bleeding is a side effect but I hate the cramps. I don’t want another period but maybe it’s just because the dosage needs to be given?