As another poster had stated, I don't get hardly anything when I pump. If baby is happy and is gaining weight and having wet diapers, then I wouldn't worry about it. My breast size went down at about 6 weeks but baby is still just as happy and healthy as before.
You can try to increase by letting her eat then pumping one side right after. You may not get much but it will make your body recognize you need more. Also drink a lot of fluids. Read this:
http://www.simplyrealmoms.com/posts/increasing-your-breastmilk-supply/
Gave me some great ideas if I need them.
Pumping isn't a good way to know what you get, just because its not as effective at getting milk. I don't think I was ever able to pump more than 2 ounces ever when I BF. I'm sure you make plenty :) Judge by her wet diapers, growth and activity.
I mean her weight gain is great, but i was pumping 2-3oz per breast now im lucky if i get two.
Put her to the breast more often. What makes you think you aren't making enough?
You can try to feed her longer and also try fenugreek from the vitamin store to help you produce more milk. That what i did to help me produce more milk for my daughter.