Pumping issues.

🌻🌺Trinkster🌺🌻 • Mamma to my little man 10/02/18 and little girl 11/29/19

I go back to work on the 2nd. My right side pumps out milk like a champ, but my left, not so much. There is milk in there. I can feel it. I massage and rub and squeeze while pumping. Anything else I can do to get more milk to come out?