I have been pumping effectively for the past 4 weeks. I usually pump in the morning after i feed my 2 month old. I have been getting a couple of ounces each morning. All of a sudden the pump is not extracting milk from one side. I tried doing it with full breasts and got 4 ounces from one side and barely any from the other. That breast also gets less engorged than the other. It seems like the baby is able to nurse from it but now I am not sure. Has anyone else heard of this? I have to go back to work soon and really need to be able to pump effectively!