6+2 heartbeat not there


I had a vaginal ultrasound today at 6+2 based off LMP and they couldn’t see much. They saw gestational sac and yolk sac but that was it. The tech didn’t say anything about it. The doctor said I can come back and see the heartbeat. Shouldn’t I hear the heartbeat by now? Is this pregnancy viable? Gestational sac measured 6+5. Just nervous after a loss.

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