You'll know when it's right for you. My older boys still don't know. My family, his family don't know (minus my SIL whom I am especially close to). We are waiting to tell everyone until after the boys know. They should know before Great Aunt Marion, don't ya think?
We were thinking of having the family attend the next prenatal with the MW. They know her and may figure out whats going on before we try to listen to the heartbeat, but I am still on the fence about using the doppler in early pregnancy...
I figure that they will know sometime before the baby is crowning.
When you are obviously showing people will start asking. You can either tell them that you are just "VERY" bloated or are infact with child. :LOL
I did tell my circle of close friends though right away. I needed some support and encouragement as this pregnancy was a HUGE suprise and was taken off guard. Plus I felt if I was to lose the baby early that this is the group that would help left me up and support me through it, just as they are doing now as my head is spinning with the thought of mothering a 9y/o, 6½y/o, 2½y/o and newborn!! Not to mention the housework!!