Thanks for all your replies. I've decided to wait until after the 12 weeks scan. It's easier now, as the hens thing is actually a day thing, as opposed to an over-night thing where drinking would be involved.
I think I would tell people, but really, I don't feel pregnant at all, and I still kind of don't believe it. I have zero M/S and if it wasn't for the 8 week dating scan where I could actually see the little blob, and plus not getting AF, then I wouldn't believe it. Maybe I'm just lucky. But really, not even one bit of nausea! So I guess I'm not in the pregnancy mindset yet. Think I will be at my 12 week scan though. I hope!