Back to work - pumping

I go back to work on Monday. My daughter is 9 weeks old and still nurses every 2-3 hours during the day. I’m a nurse and I’m unsure if I’m going to be able to pump more than one time per shift and I’m a little nervous about my supply. I’ll be going 7 hour stretches, most likely, between pumps if that’s the case. With my first I worked nights and was able to step away 2-3 times a shift but that’s not going to be feasible now Im afraid. Any advice?