High stress job

I know im not the only one out there with a job that is extremely demanding. I work 10 to 13 hrs a day, doing the job of 2.5 people due to budget cuts and am feeling completely burnt out. I'm 5 wks and i cant tell work about it because the fmla policies are idiodic. Plus i have 2 women above me who have no kids and have dedicaded their lives to work. The last time i was pregnant and confessed i felt discriminated against immediately. That time i ended up having a miscarriage. I feel like im heading down a stressed out road again with this pregnancy and im afraid of getting the same outcome :(. Is anyone else as overwhelmed and stress in their job?