Medela pump in style advanced

Sophie

Hello all. . Still trying to get the hang of pumping... I have not had any luck. I pump for 20 to 30 min each side and hardly get an ounce? My lactation nurse said some women just can't pump? My baby is 17 days old and past her birthweight so I know she's feeding, so I keep thinking there might be something wrong with my pump?? When using this pump, during the "pump" I feel the air coming out of the bottle ...is that normal? Hellllppp