Depo Shot

okay so about 2-3 weeks ago I got the depo shot. I havent really had any effects, my sex drive just went up and im a bit more emotional. But a couple days ago I had brownish red discharge, I noticed when I wiped myself. It was the dry kind and it lasted for about 2 minutes then went away. I cleaned myself doen there and then my discharge went back to milky white. Is this normal ?