birth control effect milk supply ?

Christina
Was put on birth control pills the kind specifically for breastfeeding moms.. I feel like it's effecting my milk supply even when the doc said it wouldn't? I took it for 6 days and noticed the difference in my milk supply.. has it happened to Anyone else I decided to stop taking it and see if it was the problem 🙁
UPDATE 1 
After not taking my pill for1 week I noticed that my milk is back and flowing even better! Just 2 days of not taking it I noticed my boobs engorged again and milk is flowing even better .. so no mini pill for and now I need a new birth control plan 😆