S.C.
Exactly what Momofmany said. When in doubt count the wet diapers-- if fluid is coming out you know it's going in!
As for the pumping--NOT a good indication of supply, I could pump until I was "empty" but five minutes later Isaac would decide he was hungry and be chugging from one of those "empty" breasts. It helps to change up the pump settings every so often. If you're using the Pump In Style it also helps to use the SoftFit shields and/or a larger size.
You can also try lactation cookies http://www.food.com/recipe/peanut-butter-lactation-cookie...