Announcing?!

My husband and I found out on Wednesday. That puts me at 4 wks but he wants to shout it from the rooftops and tell the world. I however want to wait until after first trimester. This is our second. We have a five y/o daughter. Am I selfish for wanting to wait? Anyone else experience this? Also my daughter keeps telling people I have a baby in my tummy.. But we have made sure not to tell her.. Idk where it how she got the idea!