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Could this be a healthy sac but out of the ultrasounds range/foc

I got my 6w3d ultrasound and says that there may be a POSSIBLE gestational sac but it's very small, oddly shaped and cannot make out if there is anything inside of it. They believe it is an ectopic pregnancy because my HCG levels plateaued last week. At 15dpo 347, 17dpo 1250, 19dpo 3864, 24dpo 5249, 26dpo 5194, 27dpo 5671, 30dpo 11466. My thought for the plateau would be vanishing twin be she totally denies this. But now the ultrasound is inconclusive, so I would like another opinion.
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replied December 1st, 2015
Welcome to e health forum.

A gestational sac can be seen as early as the fifth week of pregnancy or three weeks after conception.

A fetus can be detected as early as the sixth week of pregnancy and definitively after the eighth week of pregnancy when more of the development of the fetus can be seen.

A fetal heartbeat appears on an ultrasound as a small flickering image and the earliest this can be detected is at about six-and-a-half weeks into pregnancy.

I hope the information here is helpful.
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