Forced to work 12 hours

Sarah
Hey y'all. I'm 18 weeks and I'm now being forced to work 12 hour shifts and it's killing me. I work at a busy gas station and am forced to stand mostly all these hours with only a 30 min break. I'm not ready to quit though. And they know I'm pregnant and still making me do this. I was thinking of seeing if I can get a doctors not saying I can't work 12s anymore. What do u think ? Ugh. I can't even get up right now . Should I just suck it up ? Is it going to hurt my baby ? Thanks !!