I dunno -- it makes sense to think stress would stall labor for a mother-to-be in danger, but my personal experience (FWIW) is the opposite. My first was born prematurely amidst much family, vocational, and living situation stress. When pregnant the second time around (and more aware -- read: paranoid -- of the signs of labor for me), I was able to tell what was happening. We tried to prevent me from getting stressed about moving by putting me up with my grandmother and having DH take care of everything. But alas, I'm a control freak and he was not getting stuff taken care of the right way -- read: my way.
Our plan backfired b/c I was in the hospital to halt labor as DH was driving the moving van to our new hometown (at about 2 in the morning!). DD held on until past 40 weeks, though, so all was well.
Hope things go well for you, too, and you can soon *relax* with your little babe in your arms!