exclusively breastfeeding + pumping?

Are there any moms who are EBF and pumping at the same time?
 I feed my baby on demand but I also try to pump 1-2 times per day so I can have milk for hubby to feed and to start freezing. I'm hoping that this is okay... Do moms going back to work have any tips to share? My baby will be 5 months when I go back to work.