Has anyone noticed a milk supply drop around 6 months?

Rosemary

So baby has been breastfeed since day one, whenever he wakes up around 5 am after not feeding him at night I would usually get 5-6 ounces from one side. And yesterday when I pumped I only got two ounces. We usually give him a breast milk bottle at night which now i can’t even use cause he’ll drink two ounces in a

Minute. I hope this isn’t the start of my milk drying