Harmony test wrong ?

Taylor
So I got the blood test done. My results came back that the baby is a boy. Today I went for an ultrasound at a 3D place. She says the private area should be pointing up but it's flat like a girl. The tech says she's almost sure it a girl but they don't do gender determinations until 14 weeks usually. Has anyone ever had the blood test be wrong for them ? I'm starting to second guess my OBGYN results.