7w6d? Ultrasound appointment

According to the first day of my last period I should be 7w6d. I went to an ultrasound appointment today and baby measuring 7 weeks exactly, with a heartbeat of 145.. is that okay that baby is a little behind like that?

I actually got to hear the heartbeat and see it flicker so it was awesome. ❤️ Tech did the abdominal ultrasound, not vaginal.