150bpm

15 weeks today and baby's heartbeat was at 150bpm. I know it's just a wives tale but based on that would it be a boy or girl? This is my 4th child and I've never gone based on positioning and heartbeats and stuff but since it's my last baby, I want to hear your opinions 😊. Is it just me or do you guys get mad too when they make you wait until the 20th week for the ultrasound?