They shave your stomach to prep you for a c-section. There's no harm in shaving anywhere on your body while pregnant so long as you use a CLEAN razor. Not sure why you would WANT to shave your stomach though, it just makes the hair come back thicker and darker.
Yes! I did with my first n am doing it now with my second!
Yes, shaving your hair on your stomach is no different than shaving your legs, or under your arms...or even cutting the hair on your head. It won't affect the baby.
I've done it once but only cuz i wanted it to look pretty for my sono lol. only bad thank was some of my peach fuzz came back darker. :-\