Congratulations! That is wonderful news. As for telling people, I would stick to the 3 month rule. That still gives everybody 6 months to plan and gives you a little time to decide what you want to do. If you tell them now, they will say, what are you going to do? And since you don't know, they are still wondering. And maybe that will be more pressure on you. You don't need that. Enjoy this time instead!