My husband is upset too. At beginning of scan she was like its definitely a girl and showing me the 3 lines and labia etc. Then she went into 3d and in every view there is this thing sticking out. I know I'll love my boy but he's boy no 7 and my daughter thought she was finally getting a sister. We'd went shopping and bought pink and everything.
I've also read that 2D is more accurate than 3D so I wouldn't get too upset yet if she has identified it as a girl in 2D! X