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Yes, if you have a long cycle they can differ. In my first pregnancy my last period was December 17th which made my due date 23rd September. My ultrasound (at 18 weeks) gave a date of October 4th. I had a 36 day cycle. 3 years later my cycle was 28 days and my ultrasound was spot on. An early ultrasound, around 6-7 weeks is extremely accurate. The later in pregnancy it is done the greater the variation as babies are all different sizes.

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โˆ™ 2005-11-07 14:23:43
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Q: Can the calculation done from an ultrasound report and the one made from your last menstrual period differ as much as 1 week?
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Menstrual cycles aren't a calculation, it's really just as simple as counting from the first day of your period up until the next period. You figure out the average over your last six cycles - anything up to a weeks variation from your average menstrual cycle is considered normal - but cycles can change, it's sometimes easier to use a menstrual tracking app on your phone to keep track for you.


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When is the mid-cycle of a menstrual period?

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If you are 11 weeks pregnant on Dec 30 2009 when did you conceive?

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