When to tell???

Kasey
Hello! 
We found out Sunday that we are expecting! My birthday is tomorrow and my parents and my husbands parents will be in town, we are planning to go out to eat. I am wondering if it's too soon to tell or if we can go ahead and tell! I think this would be the best birthday ever if we did!  I know I could miscarry but then I would have people praying for me and the baby! 
I'm still in shock that I'm really pregnant. 
Let me know what yall think!