I am an exclusive pumper. I was wondering how would i know if i have oversupply? I pump every 2 hours at 20 min (no more milk coming out) about 5 oz total from both side but never felt like i have empty breasts (firm after an hour or so). If am overproducing, how can i reduce the supply? I was thinking pumping less but i get clogged ducts when i do that (ewww). Help!