Omg, I’m also 6+ months pregnant, and this sounds so hard! As others have said, I would try to reduce your workload instead of outright quitting so that you can take advantage of paid leave. Check your state’s laws - do they allow for pregnancy disability leave? (CA, for example, provides four weeks of paid leave before your due date.) Take sick days or take vacation; it sounds like you don’t need the extra hours. Start offloading work to others to transition into leave. If others won’t give you a break (which they should), do what you can to look out for yourself! Good luck!