Milk production 😩

So I have a 2 month old baby to be exact 9 weeks . And about a week ago on Friday I began to take the pill birth control , by the second day I realized my milk production was low I was making 2 oz less than I did so I noticed that for the last week I started making less breastmilk. I’ve been eating and drinking more , bough the mother milk tea , bough some fenugreek drops for breastfeeding support . And also got milkmaker cookies . And I still have low milk production! Is this normal? I had to start giving my baby formula because I leave her hungry still. I feel like I failed 😫

P.s I stoped taking the birth control on Wednesday