I went for my first ultrasound today and my baby's heart rate is 166 and I'm measuring 8 weeks and 1 day. My ultrasound tech asked what I wanted and I told her a boy, she's like well must of the time, and I've been doing this for years, baby's heart rates that are over 150 have been proven to be girls.......totally crushed my dreams of having a boy lol anyone else already know the sex of their baby and how high was their heart rate