My stepsister recently lost her 2 months baby because of miscarriage, which is said to affect 3 every 5 women in Western Europe. It costed her dear to (too?) quickly make her happiness public.
Yourself are only 6 weeks pregnant and even though that's really fantastic news (congratulations), you and your baby are absolutely not out of the critical period yet. Don't air the news too soon. That would be my advice.