6 weeks ultrasound

I had a ultrasound at 6 weeks and we only saw a sad . My hcg levels are 7,309 . And he said those numbers are a five weeks numbers and I could be earlier then I thought. Did anyone else have a empty sac at 6 weeks and later saw something . I’m just worried . I only slept for 4 hours last night because it’s bothering me .

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