We wanted them to share in our excitement from the start, and also wanted a support network if (heaven forbid) anything went wrong.
Same here.

We waited until the first blood tests came back though, to make sure that the pee-stick was indeed right and my HCG levels were at good levels.
I did let slip to Mum though before hand, because the day before our BFP we had just ordered my wedding dress and I was pretty sure the size I got wouldn't fit me at 6 months preg ><;

There really isn't a right or wrong time! And alot of different factors compell others to tell sooner or later than others. I'd just go with whatever you feel right with.

Congrats to you and your DH and here's to a happy and healthy 9 months!