144bpm heart rate, boy??

Allison
I went for my 13 week ultrasound and they said my due date is wrong, im measuring 14 weeks. Then they listened to the heart and it was 144bpm. Arent the boys in the 140 range and girls 160? Heres the pic, the baby wouldnt stop moving around lol kept jumping and spreading out. The poor tech had trouble getting the pics she needed for the tests lol