any supplementing will have an effect on your supply.
If you can nurse exclusively when you are home, that means nights too, that is the best thing to help build supply.
Co-sleeping can help you get more sleep while still nursing at night.
also, if you can wear your baby while your home, evenings and weekends that closeness can do wonders to keep things going.
good luck mama! pumping is a tough gig, but your doing a great thing for baby!