Milk for Premie-Please Help Me

I am 3 weeks pp and so worried my milk is gonna dry up before my son even gets to try to latch. A few days ago I was making 20mL+ from both breasts added together per session. Now for the last few days Im only getting 5-10mL from both added together.

Side Note: My son has been sick and not getting fed milk this last week, could my body possibly know this and be making less? When he does start feeds again he will be started at 1mL and go up.

Any advice or experience in trying to pump for a baby in the NICU.?

I really thought by 3 weeks my supply would be going up, not down. :(