Since I got married it's all I've ever heard! People asking if we are going to have kids, when we are going to have kids, are we trying to have kids yet? Are you pregnant? I have never asked anyone that and won't. It's none of anyone else's business.
onerth - I just wanted to have my 12 week scan first so that I knew things would be ok. The more people you tell, the more people you have to tell if something goes wrong.
I did end up telling them because I had an awful migraine at work a couple of days ago