Breastpumping only have maybe 300 bottles frozen in the freezer

This Friday will make a month of breastoumping every 3hrs, I have never felt so good about something the way I have about pumping as with my son I couldn’t. She doesn’t take the nipple yet, as she is on a feeding tube and oxygen and is slowly getting there.. but I have no help as of right now my fiancé went back to work and works 2pm-1:30am.. and sometimes 330am, with my son its so hard to keep up with pumping the moment I go to sit down and pump he is not listening, and being bad and getting into everything, then my newborn will start to cry, to the point I can only pump for 5 min, it’s been 2 days like this, today I went 7 hours without pumping then pumped and filled up 4 2oz bottles.. but I know I am going to lose my supply or dry up because of not being able to pump 😭

Anyone have tips on pumping with a toddler and newborn &’ being on your own?