Breast pumping help.

Jennifer

I'm back working full time now. I pump for 30 min every three hours and get 3oz for my LO. Which is what she usually eats. Today she bumped up to 4oz. I tried that upspring milkflow and my supply decreased! I stopped it and Now I'm back at my usual amount. Any ideas on how to increase what I pump? I see so many of you pump so much more.