6 Week Ultrasound heart rate low?

AJ

Just had my 6 week ultrasound. Based on my calculations I am 6 weeks + 2 days.

The baby measured 6 weeks exactly which I am good with considering how small it is at this stage.

My concern is the heart rate. The tech calculated it at 92 bpm. Both the tech and dr I met with were happy with that but it just seems so low to me compared to what I hear.

Anyone else experience this?