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Dr. Christine Marie Rubio answered : 7 years ago
I don’t think this is impossible. This is just a simple case of misinterpretation of pregnancy aging. When obstetricians date pregnancy, we don’t count from the day the intercourse happened. We date from the 1st day of mentruation. And, discrepancy from the ultrasound and menstrual counting is normal. It is very hard for it to be 100 percent match. As long as the discrepancy is less than one week, this is ok.