Dates don't seem right?

I had my last cycle start Nov 4-8. I got my first faint positive test on December 10, clear one the next day. Had my first unltrasound last Tuesday (the 3rd), and was told I was only 6 weeks 3 days at the time.

Going back to the date I tested positive originally would place me at the "implantation" part of conception. Which doesn't make sense.

Am I right to be concerned my baby is just small?

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