confusion over pregnancy dates

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http://www.allaboutmoms.com/pregnancytimeline.htm

I hope this isn't too confusing to follow. My cousin has two children. The LMP of her first pregnancy was on 10/19/99. On an ultrasound picture she has from 4/17/00 for that pregnancy, it says 21W1D+-10. We know that ultrasound goes by gestational age and not by the LMP, but even so, there seems to be a discrepancy of about 3 weeks between her dates and the ultrasound dates.

The LMP of her second pregnancy was 5/06/01. The ultrasound picture from that pregnancy (taken on 10/10/01) states that the age is either 17W6D+-6 or 18W6D+-6 (it lists both on the same picture). Again, there seems to be a discrepancy of about 3 weeks with that pregnancy as well.

What could be the cause of these discrepancies? She is certain of her LMPs. How would she go about calculating the dating of a possible pregnancy with such a discrepancy? She feels she may be pregnant again, but the last few tests have been negative. She has had many symptoms and they persist even after the negative tests.

Thank you. Your expertise is greatly appreciated.

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