Baby's gender

Jessica • I’m 28 years old, been married for 8 years and have a beautiful baby boy who’s almost 3 and have one on the way!!
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.