Can a sonogram be wrong about your due date Last period was Nov 3-5 of 06 and when the done it said is Sept 20 means pregnant in December guy with STERILE?

A sonogram can sometimes be wrong about your due date, although it is usually accurate within a few days. The due date is calculated based on the date of your last menstrual period (LMP) and is typically 40 weeks from that date. However, there is some variation in the length of a pregnancy, and some women may ovulate and conceive earlier or later than expected. This can lead to a difference between the estimated due date and the actual date of delivery.

In your case, if your LMP was November 3-5, 2006, and your sonogram indicated a due date of September 20, 2007, this would mean that you conceived in December of 2006. However, it is possible that you ovulated and conceived earlier or later than expected, which could affect the accuracy of the due date.

Additionally, the accuracy of a sonogram in predicting the due date can also depend on the stage of pregnancy at which it is performed. Early sonograms may be less accurate in predicting the due date compared to later sonograms.

It is important to keep in mind that the estimated due date is just an estimate, and the actual date of delivery may vary. Your healthcare provider will continue to monitor your pregnancy and may adjust the due date based on your progress and other factors.