Help with announcing to friends!

Ercmp
Hey everyone! I am having a hard time deciding what to do. First sono apt is tomorrow and I will be 8 weeks.  Hubby and I decided we are going to tell family for Christmas.  Next week we have my best friends 30th birthday and then New Years.  I really don't want to hide this any longer from my two best friends, especially when it is going to be really tough to go out and celebrate everything, but I also don't feel comfortable telling my friend on her birthday.   Our other best friend is already pregnant. Soo I am debating whether I should tell them together or separate and how/when to do this.  Any suggestions?  We also have two other friends who will be visiting for a few days from out of town and would be nice to share the news with them in person as well.  Just getting overwhelmed on the details and logistics of al of this and overthinking everything!