Christmas announcements?

So, I know it's super early (I'll be 5wks tomorrow) but I would love to see the look on my dad's face if I gave him a card that said 'grandpa' on it. If it weren't for the holidays I would want to wait until 12 wks to be safe. 1st pregnancy so I am super nervous and excited. Is it too early to tell immediate family? Anyone else struggling?