Pumping concern

I feel as if my supply is continuing to drop. I still breastfeed 5-6x a day, and I pump 2x during the workday. My supply has been dropping drastically. Any ideas why this is happening, and is this indicative that my babe isn’t getting enough through breastfeeding too?! I’m very concerned about why I went from pumping 4 ounces (not a lot already), to only 2 ounces in a pumping session.