Urgh supply decreased!

Shiona • So in love with my baby girl! 5-3-2017

I've been up pumping from 2am-3am just so my baby has enough milk for daycare tomorrow😒. And she still needs another 2-3 more announces. Initially I was pumping at least 12 ounces if not more at work, now I'm down to about 8 ounces. Any tips. I take fenugreek 3 times a day, the doctor prescribed me reglan, I've been eating steel oats & drinking a lot of water. My baby is almost 4 months old & I just went back to work August 2nd. Could my pump parts need replacing already??? Appreciate any help I can get ladies thanks!!