I have a PISA and generally pump for 20 minutes and get 5oz. Today I've been pumping for nearly an hour and barely have 4oz. I don't feel empty! If I do compressions, more comes out but the pump, on the highest suction, doesn't seem to be getting it out. I've tried hitting the letdown button throughout, which helps a little.

I don't feel any pain in my breasts, they're not hot, red, or sore. I'm feeling exhausted but I really don't think it's mastitis or a plugged duct or anything like that. But my pump isn't making funny noises or anything like that. It seems like its functioning normally but it's really taking forever!

What the heck is going on??