Will I be able to see heartbeat at 6w2d ultrasound?

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Today I went to have a ultrasound at 5w2d and only a gestational sac was seen. Not even a yolk sac. Is that normal to not see yolk sac yet? They scheduled me a week later at 6w2d to have another one done and said I should see heartbeat by then. I'm worried it might be to early still to see heartbeat. Anyone else have similar situation?