ultrasound tech ERROR

I went to have a private ultrasound yesterday... I told the tech I wanted a gender reveal party and were planning it this weekend if she could identify the gender. We discussed the various items in the store that were available for gender reveal and that she could package it up for me. My husband was not present at this ultrasound...and as she was looking at the baby and trying to get that perfect angle... she blurted out, "it's a girl." She almost acted as if the previous conversation did not happen. She told me repeatedly it was a girl and printed out the pictures with "it's a girl " posted all over them. I was in shock! I left there so confused, excited, angry... we cancelled our gender reveal, I had to tell my husband I knew the gender and he wasn't there for it..I'm still in shock. Has anyone else had this experience?