I saw both of my girls heart beat at 7 weeks
I was 10weeks, my OB wanted to make sure I was far enough along to defiantly hear it because if they do it too early you may not be able to hear it and it scares moms.
Saw and heard it through transvaginal ultrasound at 6w
i had my scan at exactly 7 weeks and i got to see the heart beat and my tiny itty bitty baby. i have a picture of it on my profile. it was a cute fast flickering and it was honestly the best feeling in the entire world. but some doctor are different. mine did it as soon as possible because i had a miscarriage before this pregnancy. good luck! :)