Work is stressing me out

Ok so I work at a senior living home its not so much the work but I am 24 weeks lifting heavy patients I haven't really paid allot of attention to it really but I just don't wanna hurt the baby but the work is not my concern at this point I work 3rd shift but in the morning the 1st shift people think everything has to be picture perfect we dont have many people on our shift most days I'm

doing everything by myself they always find something to complain about honestly I'm really tired of it but me being single parent of a toddler and one on the way I do need this job how should I stop letting this job and the people stress me out I know I'm a hard worker even while pregnant