Ultrasound seems to not match

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Ultrasound seems to not match

Hi gals I'm concerned about my dating it seems to be off! 6w1d my baby's bpm were 159 which seems high and its hcg levels were at 67,334. I really thought I was 7w0d the day of my ultrasound, but I heard transvaginal ultrasounds are usually only off by 2 days, has anyone else's 6w baby have high hcg levels or a high bpm or been up to six days off?