hi are you saying your sac is measuring bigger than your dates if going my last period by a week? Was this IVF or natural conception? If natural that can be okay as the last period is just a bit of a guess as to when you ovulated and conceived but even if IVF then a mm or 2 out in scan measures can make the difference here. Your HCG seems fine, doubling well, and too early to see much in a scan other than the sac so the doctors saying return again in 2 weeks seems the most sensible thing to do as by then you should be nearly 7 weeks or just over and that scan will tell you a lot more. Good luck xx
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