How early for doppler heartbeats?

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How far along do you have to be for hearing the heartbeat on the doppler (not ultrasound just doppler)? My 10 wk appointment is coming up in a week and a half and I’m hoping to get that reassurance and I don’t remember from my previous pregnancies when they started that. I already had my dating scan so next scan will be 16 weeks and just trying to figure out what midpoint will be my next real reassurance.