Tech said it's a girl... but have a feeling it's a boy. Opinions?

Allison
I am currently 22 weeks pregnant and due May 10th. We went in for our anatomy scan at 20 weeks exactly to find out the gender. I have wanted a girl all along but had the feeling it was a boy. At the ultrasound, the tech said it was a girl or if it happened to be a boy it's a very sad boy. But,I still have the feeling it's a boy and have dreams about a boy. Has anyone had this happen before?? Opinions???