measurement at 12 week scan

Had booking in scan today was so relieved to find baby ok, after having some light brown spotting this week - all was well - I thought I would be 12 wks+3-5 days based on prev early scans, but today they bumped me up again to 13 weeks - which is actually further on that I could be! but never mind lol
anyway have looked up things about fetal length, I measure 66mm today (or rather baby does, not me!) which everything else indicates that is 12 and a half weeks not 13 which I would have thought more correct. I know it doesn't really matter for the sake of a few days, but how do these thing work? She seemed to be basing it purely on length, so is this in line with what other folk had, or do they measure other stuff to work it out too?
xxx

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