Ultrasound at Hospital or Medical Imaging Facility

I had an ultrasound at the hospital for bleeding a few weeks ago. They said I was 6 weeks 6 days and my due date was July 5th 2016. Today I had an ultrasound with an ultrasound tech and she said I was 9w2d! If the hospital was correct I should be 10w1d. Who's more accurate? Both transvaginal.

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