What's your baby's heart rate?! girl or boy?

I'm a little concerned... My first was a boy and his heart rate was 145-148 throught the whole pregnancy. So with my second, heart rate is 130's and it's a GIRL!! What?! I thought girls heart rates were higher 150's-170's!! I don't have another ultrasound soon and my baby shower is in two weeks!! What if it's a boy 😳😳. What do y'all think? I'm posting her ultrasound that I had done at 20weeks....