Congratulations FBW!
Now listen here - be a militant mummy to be!
Your airline has to listen to you when you're pregnant - if you're tired - say so. If you're working crap hours - say so. I had a letter form my GP who was concerned about the v. early starts a pregnant lady had to do so my airline VS changed my ground job - only because I created a fuss though. I got a great job working part time hours with a full time salary! Stick up for your rights - its the airline that grounds you (obviously for all the right reasons ie you & the bump) so you needn't take crap conditions when its not your job to.
Put your feet up as much as you can. The easy bit is being preganant & giving birth! You can do it!
Go girl.