Your milk supply may vary daily. To maximize your milk flow, try to pump at the same time and place each day.
Stress and fatigue are your biggest enemies, so try to relax.
To get in the mood during pumping breaks, some moms like to have a picture of their baby handy, an article of baby clothing, or even a recording of their baby's babbles and coos.
And remember, you're still a nursing mom, so eat well and drink plenty of water while at work.