As a frequent business flyer I know it takes it out of you, it's not like flying for a holiday. I usually do day trips and that means going up and back in the same day. I did my last trip at about 20 weeks, I was getting too tired and just told them I can't do them anymore. My OB was on my side and only advised them if I could stay a few nights. If they are wearing you out definately say something, they shouldn't try to hold working from home as a bargaining chip, that's just wrong. But also being in a corporate role myself I know it goes on.

Your dr can always write a letter to ban you like mine was going to with me, he thought I was nuts doing the day trips and wouldn't doesn't let me now.