Has anyone ever had problems with their pump working? I'm exclusively breastfeeding and I've noticed that when I'm at work I'm getting less milk (only 2 ounces each time) and my breasts are engorged by the time I get home. I double pump for 20 minutes. My breasts feel soft when I'm at home and my baby's eating and he seems like he's getting enough to eat. But now I'm worried because I'm running out of my freezer stash and I can't replace it fast enough with what I pump. Maybe I have the wrong breast shield size? I've noticed my left side produces almost nothing when pumping. Am I drying up? Help?!