Heart Beat💖

So, with my son I just knew I was having a boy . His heart beat was always between 150 and 154 . Based off of what people have told me, that is high for a boy . I'm currently 15 weeks and I have the same feeling this time that I had last time only I feel like it's a girl.I have done all of the old "wives tales " and they all say girl . My mom, my husbands grandma, and my husbands mom say girl too. My husbands mom was right about my son . I have a fetal doppler and the babies heart beat is usually between 157 and 160ish . So its kind of throwing me off because it is so close to what my son's was .... I'm curious to know what everyones babies heart beat is and what they are having ?