Infected?

Jessica
I had an emergency C-Section on 1/28/16 @ 3:22am. I have been trying to keep it clean and dry. My belly hangs over and the skin on my belly stings and there is a hard lump. Now the middle of my incision is starting to look red. If I hold my belly up while I walk, I don't feel it stinging. I have an appointment with my doctor this Thursday but worried it may be infected and if it is, they put you on antibiotics and that lowers your milk supply!!