An Active baby could be a Boy or a Girl?!

Enaam
Hi guys,
I'm 15 Weeks pregnant and had my ultrasound done two days ago. The doctor was trying to preview the gender but the baby wasn't cooperative. But she assumes that it's a Girl because she is not active! 
This my second pregnancy and I have a girl and she would always appear active on ultrasounds. 
What do you think?

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