Feeling like I can’t do this anymore

I work full time and I’m on my feet all day. I get barely any sleep because of the pains. I feel like im dying of exhaustion.l, My body is slowly giving up on me. At my job if you mess up you get written up immediately. My pregnancy brain already made me get written up twice, and my manager is just waiting for that last strike to get rid of me. I only get 6 weeks maternity and I am fighting for more. My feet are swollen sometimes to the point that I can’t physically move and have to stay home. 3 call outs and that’s a written up. Basically fuck my life. I’m only staying for the insurance, which they pay most of it. But idk if I can do the anymore, I’m mentally and physically drained.