Breastmilk Supply

Kasandra
My LO is 3 weeks old. He hasn't latched yet but I've been keeping up with the he pumping - up until the beginning of last week when I noticed I had a MAJOR decrease in my supply. When I say major decrease I mean I was able to pump a total of 6oz-8oz in one pump session now I'm lucky if I get 1oz.
I've tried the lactation teas, cookies and brownies from Milkly-Mama and all it did was increase the fat in the milk.
Tips/Suggestions please?? :(