I don't want to tell my husband I'm pregnant right off the bat because he can't keep a secret and wil tell everyone when I want to wait!

I don't want to tell my husband I'm pregnant right off the bat because he can't keep a secret and wil tell everyone when I want to wait! Anyone had this issue? I want to wait I'll after we get our first ultrasound to tell everyone. My husband has a big mouth and I know he will tell everyone. I just want to be sure we are pregnant and everything is okay to tell everyone.