Oh i am so sorry to hear your hopes for a little princess have been dashed. I can't imagine what you are going though now after hearing it is a girl, and them now telling you it is a boy.
I hoped so much that my 3rd little bubba was going to be a girl. But i guess thankfully i found out he was a boy at 20 weeks, so it gave me a long time to process it. certainly look at joining the gender disappointment forum. I am sure you will find a lot of support there from women who have been in a similar situation to yours.

Hugs again!