People need to mind thier own business, especially at work. Never got the pregnant thing, but have often had people say out of line things to me about anything and everything under the sun, sometimes personal things, too.
Just remember that if people are usually that rude/mean to say things like that, they are usually the unhappy ones, so console yourself in the fact that you are EXTRAORDINARILY happy and they may never be, espcially if they keep being a jerk like that.
You KNOW that you are beautiful, so try not to worry about it sweetie!