Baby's heart rates

Hey y'all! I had by 10 week ultrasound the other day and baby's heart rate BPM was 158. Any one else in this range know what they're having yet?!? I talked to a client today who's an obgyn and she said the high rate/ having a girl etc. isn't an accurate old wives tale. So guessing it's not true, although I've heard otherwise. ??? 
I'd love to hear your opinions and results of you know the gender by now!