Gender disappointment at BIRTH?

Has anyone waited until the birth of the baby to find out the gender and been disappointed? We currently have two boys and while I know I'll be happy with another boy, I really want a girl this time. And I have a teeny tiny feeling it's a girl and I feel like I'm going to have my hopes up that it's a girl. We are going to wait until birth to find out, but I'm scared of being disappointed in that moment if it's a boy! I'd almost rather just know ahead and be able to let it set in if it's a boy. Opinions?