Cutting work hours?

When did everyone's doctors/midwife's cut down you working? I'm 27 weeks and I'm on my feet 9 hours a day and my job is very stressful. I really feel like I can't do this anymore working this much; but it seems like my midwife doesn't want me to cut my hours anytime soon and I don't know what to do. I just can't deal with the stress from work.