Perhaps it's a little early for me to be worried about this, but I went back to work this week, and I pump 2x per day. I'd add in a session, except that I'm getting very inconsistent volume per day, and seem to do better when they are more spaced out. One day I barely got anything in the 1st pump (4 hours after I nursed), maybe a total of 1.5 oz, but I got a whopping 5 oz total in the 2nd pump (again, 4 hours later). The next day, I got more like 4 oz in the morning, and nearly 5 in the afternoon. Today was more like the first day, barely 2 oz in the morning, after pumping for more than 15 min on each side, but 5 oz in the afternoon. I nurse LO in the morning before I leave, she gets 3 oz bottles, 3x per day while I'm gone, and I breastfeed her again before she goes to bed at 7:30. She usually wakes up around 11pm and again around 3am for additional feedings. So she's getting a total of 7 feedings per day. My concern is I'm not pumping enough to keep up with what she's getting from bottles, so my freezer stash is going to diminish rapidly.
I'm eating steel cut oatmeal for breakfast and drinking nursing support tea 3-4x per day. Anything else I can do to help increase my supply so I can keep up with LO's needs?
Re: Pumping at work inconsistent and low volume
Snacking might help too. I've been using a calorie tracker for months now to make sure I'm eating enough. You're also going through a change of going back to work, so it might just take time. Try to relax, drink more water than you think you should, eat enough, play with the settings on your pump and stay consistent.
I also wake up early in the mornings to pump. I couldn't have made it this long without doing that. LO gets up at 6ish, so I get up at 5 to pump and get 506 ounces. It also allows me time to get ready in the morning. If your LO STTN this might be an option. It sucks and I'm counting down the days until I can sleep until 6, but its very helpful.