Why didn't I get a copy??

Alyson

So I had my anatomy scan and may have to go back in a few weeks because she couldn't get a good image of the spine. Have to wait for the dr to review to see if I go back. She showed us towards the end that the baby was a girl after legs were crossed for most of the scan. I still didn't feel she was 100% but showed us the "3 lines" and stated that indicates a girl. Why didn't I get a "potty shot" picture like everyone else seems to at this scan? Should I trust it's a girl? My son and I really thought it was going to be a boy lol anyone have experience? I'm really driving myself crazy with this.