Baby's heartbeat gender myth?!

Taryn • Grace Brynn Galligar 03-07-15
So a lot of people, including my ob/gyn, have been joking saying that the higher a bpm, is a girl, and a lower bpm is boy. Is there any truth to this? At 8 weeks my baby's bpm was 182, and 170 at 12 weeks. Possible girl?