You moan away, there's something particularly galling about a pregnancy we seem to be expected to piss our knickers with excitement for....
Zara popped into my thoughts too
We tried, sometimes seriously sometimes not due to other health issues cropping up/redundancies, for about six years. I had feelings about other people and their pregnancies I didn't believe it was in me to have but there you go. Infertility is certainly a lesson in yourself, there's corners of you that surface unexpectedly....
I got lucky and had dd completely by accident (annoyingly at a time we'd parked the whole thing to move cross country and make a new start - we were the mythical 'relaxed' about sex etc.) of course I now find myself pining for a second.... I can't lie though, dd makes it all easier to live with.
I cant ignore the fact that kate doesnt even have the normal worries of feeding, clothing as many kids as she wants or whether she'll have any support or get a break..,,
Superficiously I wish them well but inside I'm a bitter old envious hag! 
Hang in there op and make use of the places you can let these feelings out x 