Re: only getting 3oz!!!!!
Ok, I guess you need to give more information. Are you using a double electric pump? How long are you gone from baby? I know I have supply problems and when I am away from baby I am lucky to get 1.5oz total every 2 hours. How old is the baby? Is he gaining any weight, or staying the same, or losing? Have you seen a lactation consultant to find out if you have a bad latch or other easy to fix problem.
Having to supplement, if actually necessary, is not the end of the world, but it is sometimes recommended when it is not necessary.
If you actually need to increase supply, there are herbs that will help, the type depends on the reason you are having problems.