Trouble With Milk Supply

So I've notice ever since I started my

birth control I have been only pumping

1-2 oz of milk from each breast some-

times its 0.5 on each. I used to pump 4

oz from each. I have tried everything to

build my supply. I've tried Fenugreek, up

spring milk flow, lactation cookies, and

the pink stork lactation tea. I never really saw a difference. And I really do not want to fully feed my baby formula (nothing wrong with that) I wanted her to breastfeed for another 3 months but, I really cant when she isn't really satisfied anymore and I have to give her formula right after. If there is anything you know that might work please let me know. I love bf my baby and dont wanna stop. Thanks