Will my milk fully come in?

Jackie

First time mom. My baby is 5 days old and couldn't latch due to my inverted nipples. Ever since the hospital I've been pumping religiously to try and get milk. For the first time yesterday I was able to get about 2oz total throughout the day. But that's not nearly enough to feed baby. How long does it take for milk to fully come in? Or is this it? Feeling super discouraged and useless that I can't feed my baby.