Baby girl

So excited that we found out yesterday we have a princess on our hands. She was very uncooperative and sitting extremely low behind my pelvic bone so we do have to go back for another ultrasound to continue checking on things. Has this happened to anyone? Also did anyone feel a little gender disappointment? This is our first and I always thought I would have a boy first so hearing girl was mind blowing. I'm nervous because I'm more of a Tom boy so just want to do it right by her...