Baby's gender

Jessica • I`m 24 years old and married for a year! And I'm expecting my first baby
For those who know there haveing a girl, was the babies heart beat 160-170? My dr says it may be a girl Cuz of the heart rate. And I did the Necklace thing and it stayed still, did that rly work with yall? I find out in 5-6 weeks but I was just wording :) thank you.