can the ultrasound give wrong gender ??

Shimaa
Hello
I went for a private ultrasound today to know the sex of the baby 
They told me that I am having a girl
I have a three years old girl and this pregnancy is completely different from my first daughter pregnancy so I was sure that I am having a boy 
But I was shocked when they told me it is a girl 
I want to ask you can the technician was wrong ??
I can't believe that it is a girl

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