Work stress during pregnancy

15wks pregnant with my second child, my first is nine years old conceived right out of high school. I honestly pictured this pregnancy as being much less stressful as I have an excellent support system and financial stability but I have to admit it has been a HUGE struggle. I have a high stress job in the mental health field requiring travel and lots of overtime. I find myself so exhausted and stressed out daily that I cry myself to sleep. My partner is urging me to stick it out because of the insurance and $$$ but I'm beginning to wonder if it's worth the stress on me and baby. Any other momma's out there employed in high stress careers? What are you doing to prevent burn out and maintain healthy pregnancy? Help!