6w2d: Heartbeat seen but not heard

(Ultrasound image below)

I'm currently 6w2d.

Ultrasound says gestational sac 13mm, yolk sac 3mm and fetal pole is 3,2mm (5w6d).

We saw the heartbeat but we didn't HEAR sound, I don't know why.

Is all of this normal? I had miscarriages before so I don't know what to think.

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