When and Who to tell

Megan
Just wondering what everyone's opinions are on telling people. I was TTC so I found out I'm pregnant pretty early. I am 4wks5days, I have obv told my mom and some close friends. But many people say you should wait until like 2 months to tell people. Is this an old fashioned notion? I would really love to tell my family on Christmas but my first Dr appt isn't until Jan 13th. Any thoughts?