Milk supply

Nichole
My baby girl is 2 weeks old today and I strictly breastfeed. I'm trying to start freezing some of my milk for when I go back to work but I feel as if I don't have as much of a supply as I first did. My breast don't seem to get full like they did before and when I pump I only get an ounce at a time out of each breast. The first 4 days she was born we were in NICU so I had to pump and I was able to get 1 or sometimes even 2 ounces at a time. Is this a normal or average amount that I'm getting and if not what can I do to produce more?