Whenever you're comfortable! It has to be your decision, when you're most comfortable doing it.
With DD we waited until 13 weeks.
With this one, we told MIL and FIL at 8+1 as DH needed advice on a situation and they needed to have the whole picture.
Then I couldn't hold it in any longer, we told the rest of our families 9+2, and then everyone else later that same day.
You have to go with your comfort level. Telling early won't cause a miscarriage or make anything bad happen. On one hand, if something were to happen, it could mean a lot of support from people. Though on the other hand, for some people, the pain of having to tell people the bad news is just too much or they'd rather deal with it privately rather than having people constantly ask how they're doing.
It's a very personal decision, but you have to do what's best for the both of you and not what everyone else thinks you should do. If your OH wants to wait longer, maybe you can compromise?