We are just at 13 weeks and ready to tell extended family (our parents know but no one else does). H's family lives across the country, and they're all at his brother's house this weekend for his sister's birthday. We're going to call to wish his sister a happy bday--we also thought we'd tell them our news. Is it not cool to tell them on sister's birthday? Should we call later in the weekend to tell our news? What would you do?