Baby measuring small on ultrasound?!

Amanda
So according to my lmp I should be 8w4d. Had an ultrasound this am and the ultrasound tech asked if I was sure and I said  "yes I am 100% sure my last period". She says the pregnancy is only measuring maybe 6 to 7 weeks and the heart rate was around 100. Commence freak out. She didn't seem concerned at all but she's basically saying I got a positive pregnancy test before I even ovulated! Has anyone had a similar experience??

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