We told my family at about 6 weeks, the day after Mums birthday, that way everyone was around and i wasnt telling one first kwim?
DH family was told later, around 10 weeks, maybe 12, cant rememebr now.

I told a friend early (after Mum and Dad) as she was about to go round australia and i didnt want to tell her on the phone. A couple of other friends new early...
one of my workplace knew at about 9 weeks as i am a nurse and i couldnt work with some patients pg. the other workplace i told at 14 weeks (my boss was away when i hit 12 weeks)

The other friends i told at 12 weeks and i was on a Liver clensing diet so i couldnt drink alcohol or any processed foods!!! that was the best and most plausable excuse we could come up with.
Most people were told after the 12 week scan thou