Working 12 hours while pregnant

Michelle • I love cats ♡
Recently I've told my boss I am pregnant. My work has 3 shifts. 8 hours, 10 hours and 12 hours. Somehow, she keeps putting me on 7 to 7 days. There is a few other pregnant women in my work, and they get to be on 8s or 10s! When I work 12s, I am exhausted, nauseated, back hurts, my feet swell...all she can say is don't lift heavy stuff...well other people help me and lift it, but they can't help me every 5 minutes and I end up doing it myself. I am considering when I go to my obgyn, that I am getting a doctors note because this is not fair at all.