Pregnancy announcement

How long did most of you wait to announce your pregnancy? I'm 36 yo, 4wks pregnant, have 2 adopted daughters, but this is my first pregnancy. Obviously my husband knows, but part of me is considering waiting as long as possible b/c I did have a previous miscarriage (though very early on). Another part wants to tell my whole family now b/c I'm very excited. I'm also considering telling my oldest daughter sooner than later b/c she turns 21 in Feb. & I want her to know why I won't have a glass of wine w/ her during her big bday celebration.