Depo-shot symptoms

I recently just started depo shot Jan 21. I don’t go back for my second shot until April. Anyway ... I’ve been experiencing brown or light pink blood when wiping. I wear panty liners and the liners are brown after using and I think I have brownish small clumps that may be discharge. Help is this normal? I want to stay on birth control after having my son. But I don’t think I can handle this bleeding every day because it messes with my area down there because I’m always moist due to the liners and I get irritated and itchy from the moist.

I need advice and help.