advice?!?! low milk production

Advice please!!!  2 weeks since I've had my daughter and can't seem to pump more than 2 oz every 3 hrs. I offer to breastfeed first- occasionally she will but often refuses and she gets frustrated trying to breastfeed. Not sure why. Lactation always told me I was doing great to keep it up and she would get better. Long story short, we had to start supplementing her. She takes 3 oz every 3-4 hrs and sometimes I only make 1 oz. Lately sometimes she wants to eat again after only 1- 1 1/2 hrs. I drink as much water as possible. After I offer her to nurse my husband then gives her what I pumped from before then finishes with formula. I haven't bottle fed until today- my husband has been to try to avoid confusion. We also have not given a paci due to trying to avoid confusion. I pump until 2-3 min after I stop getting milk to try to encourage more milk production but nothing. I really want to be able to just nurse her but am exhausted. No time for anything esp since husband has gone back to work and I have had to start bottle feeding as well. Breast feed, bottle feed, pump, eat, sleep, repeat... Any advice? Will my milk ever really come in? Is it too late? Seriously thinking of giving up on breastfeeding...