Concerned mom

I have a 4 year old girl that I love to the moon and back. During this pregnancy, I was convinced it was a boy and I was soooo excited. I found out last week that I am having another girl and I cried. I wanted a boy so bad. I keep telling my husband and myself that I am happy and excited, and I am excited to have another little one. But I am so disappointed that it isn't a boy. I feel like I've disconnected myself or something from this baby. I keep waiting for the disappointment to go away and to start feeling authentic happiness for us to have another girl around.
Has anyone else had this feeling or am I alone?