pregnancy announcement

When is it okay to announce you're pregnant to loved ones? I've always heard "don't say anything until after your first trimester" but I see others announcing as soon as they find out? It's my 5th pregnancy (2 beautiful daughters and 2 angels that were too beautiful for earth) and I'm hesitant on when to tell them. I've read weird things as "don't tell them too early because negative vibes can get to the baby" (lol) I'm 4 weeks 5 days and confirmed by baby your baby. Both my husband and I are dying to spill the beans.