When to tell people I'm expecting?

Shianne • My daughter was born with Cleft Palate! TTC #2!Instagram: @shianne_parham
Hey girls so currently I'm 7 weeks pregnant and I am going for my first ultrasound on December 21 (8 weeks 6 days). And we are planning to surprise our immediate family's on Christmas... I will be 9 weeks 3 days and I am wondering do you think it's too early to tell people??? This is my first pregnancy and I really don't have any health concerns at this point, it is a natural pregnancy and we did ttc for a year. I am 21 hubby is 27 and no family history of miscarriage, when are you planning am telling?