Boy or girl? Confused!!

Anna
Hello, so I'm 20+6 and had my 20 week scan today at the hospital. I paid for a private gender scan when I was 17 weeks where they told me it was a girl (see photo). Anyway today at the hospital, the sonographer had a rushed look and said 'boy' but didn't really show us how she knew what she saw, no boy bits but has now wrote it on my notes that it's a boy! 
Please bear in mind, we aren't bothered either way but wanted to know just so we could start buying! 
Has anyone else had an experience like this? Has anyone else been told boy/girl which turned out wrong? And also what do people think looking at the scan photo from my 17 week gender scan? (The photo is taken as if baby is sat on the camera and you can see one leg only) Please help! 🙃

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