Has anyone else been told at there 12week scan the sex of there baby?

I was at my 12 week dating scan yesterday, and Im actually 13 weeks as she calculated and she said do you want me to tell you what I think it is and I said go on then and she went don’t buy anything for it yet tho until ur gender scan and then she told me yeah that’s definitely a boy she could she his parts but I was thinking how can you tell this early ? Like has this ever happened to anyone else ? Or it’s been wrong ?

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