Not certain: At an HCG of 813, it is usually even too early to see a sac in the uterus. At just 4 weeks gestation (usually measured from the first day of your last period), this number would not be innapropriate. I would have them repeat the HCG in 48-72 hours and repeat the ultrasound about 1-2 weeks later.
Answered 6/10/2014
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