Baby heart rate...

Jessica
My baby's heart rate was 138 today. Is it a wives tale that the lower the heart rate it's a boy? We are not finding out ( I wanted to, but my husband didn't). I'm just curious to hear if it's true or not. As of right now my gut has been telling me it's another boy. I was hoping for a girl by obviously I will be happy no matter what! But would love to know your thoughts!!