Going back to work while trying to maintain supply is really stressful, and it's so normal to feel anxious about it, especially as a first time mum. I exclusively pumped too and what helped me most was protecting my pump schedule strictly at work, I treated each pump session like a non-negotiable meeting in my calendar so colleagues knew not to book me during those times. Try to pump as close to the same times you do at home, because consistency really is important