Can my job kill my baby!!???

So I'm a waitress and have worked at the same place for about 4 years now for the most part I enjoy my job how ever I'm very concerned for my baby's well being you see I have already had two miscarriages while being employed by them. I am very scared to do anything wrong with this pregnancy!!! I was never given a diagnostic on ether miscarriage my Dr told me it's not uncommon however this didn't make me feel any better!! My job consists of long hours (8-12 hours) graveyard at that!! I also am constantly working at a fast consistent rait with only one 30min brake (sometimes to busy so don't get one at all) not to mention all the lifting the trays weigh any ware from 10 to 50 pounds we also have to buss all the dishes witch are also very heavy and can weigh up to 50 pounds as well!! And then there is the STRESS!!! I get little time off and always spending it catching up on missed sleep and the costumer are very rude and hurtful do you think working in an environment like this can be dangerous for my baby????