breastfeeding and birth control

Ciara
I have been taking birth control for a bit over a month and it's the mini pill. I breast feed and pump but I have been noticing that since starting my birth control I'm pumping 4-5 ounce between both boobs compared to 8-10ounce I was pumping when I wasn't on the pill. I stopped just one day ago taking the pill and I pumped 7 ounces his morning. 
Has anyone noticed supply issues on the mini pill.