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It does sound like baby is measuring small. But you never know what could happen in a few weeks' time! With Devon, he measured about 4 weeks and a few days at my first ultrasound, and then 8 or 9 days later, which was my second ultrasound, he measured about 8 weeks and a few days. So he "grew" four weeks in just over a weeks' time. Does that make any sense?
You would think that all this stuff would be more accurate, but sometimes it just isn't, ya know? I really, really doubt that her date of conception was March 13th if a regular (and not a blood) test was positive 5 days later on the 18th. That is just almost impossible. I'm sure the docs just used the "average" cycle lenght to calculate those dates, as they always do unless you know your exact dates. Some women O early and some later... I would think that your sister O'd a bit earlier than usual, and conception could have been about a week or more before the 13th.
But who knows!! Only time will tell.
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