Too Early or Miscarriage??

Had my first ultrasound today and the results were not what we were expecting. Based on my last period and pregnancy tests I was estimated at 9 weeks. When we did the ultrasound it showed two sacs but they were empty. Is it possible we miscalculated and I'm still just too early?? Or could I be on my way to a miscarriage?? I know you all don't know me, but any positive thoughts, vibes or prayers would be greatly appreciated.

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