Breastfeeding working mommas

Erin

My baby is 13 weeks and I've been back to work for a month now. During my maternity leave I was able to stock pile a good amount of milk to freeze for her to have while I am at work. Well my stash has now dwindled and even with pumping at work and every night before bed, I can't seem to keep up with what she needs. Im starting to think about supplementing with formula. It's definitely not what I wanted but I'll do what I have to. Any working moms out there for have any input on how they made it work?