Gender US too early at 14w6d?

Samantha • I am 24 years old, getting married to my best friend on October 21st, 2017. We are expecting our first child March 2st, 2018.
So I have a friend doing our gender US for free. We plan on Thursday September 14th, I would be 15w6d but she said she forgot she doesn't work that day but could do it this Thursday (14w6d). I'm just afraid that's too early? Of course I am super thankfully and willing to do it any day she can. Just not sure if I should schedule an elective US at 16 or 17 weeks to double check?? Thanks in advance for your vote!

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