Ultrasound/menstral cycle Vs Bloodtest

Hi Mummies, I recently found out that I was pregnant. Based on my 5wks menstral cycle, doc says i shd be abt 4wks plus pregnant. Did an ultrasound scan too and baby is in right position. However, after doing a blood test, it says tt I am likely 2-3wks pregnant. Any idea why the difference? Which is more accurate? Thanks in advance.

Anonymous

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Some ladies may ovulate on a longer cycle, and maybe the egg gets fertilised later! Thus the difference. :)

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Counting from the first day of your last mens

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