Black friday and pregnant rant

I work in retail. On black friday (thanksgiving) my boss told me i have to work 3 pm to 12 am pulling pallets of tvs for customers. At that time ill be 34 weeks. Im getting c section at 37 weeks. Due to high blood pressure. Isnt this the stupid thing you've heard? I go back to the dr. on the 10th. i think im Going to get a dr note saying i cant work this black Friday. My management Dont even care.