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How accurate are ultrasounds at dating pregnancy

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The accuracy of an ultrasound test can vary based on factors such as the stage of the pregnancy, the quality of the machine, the skill of the practitioner, and the position of the baby in your womb.Here's some info about the reliability of ultrasound for different pregnancy concerns.However, if the very first ultrasound shows the baby's size doesn't agree with your period dates OR you're unsure of your period date, then that earliest ultrasound determines the due date.All subsequent ultrasounds are to compare the size of the baby to the now known age of the pregnancy from the first ultrasound or period.Other ultrasounds at 19, 21, and 27 weeks all gave EDD of 11/12. Totally 6 ultrasounds have all given you the same EDD - 11/12.Given this information, would it be possible that all of my ultrasounds were a month off and I conceived Jan 18? Based on this EDD, the last date of your period would have been 5th of February.Ultrasounds are more accurate than using the LMP and, if the ultrasound date differs from your period dates, the ultrasound date will be used.

If you have an irregular cycle, or if you've recently been taking the contraceptive pill, working out the date from your LMP isn't a very accurate method.

The due date should not be changed midway through your pregnancy.

The pregnancy should be dated from the first day of your last period.

Could the birth control not have worked in Jan, the embryo lived through the withdrawal bleeding, and the fetus has continued to measure small throughout the pregnancy? According to this period date, the most likely date of conception would be around 14 days after the period, that is around the 19th of February.

Ultrasound has intrinsic error of upto maximum 5 - 7 days, so the probable dates of sex would have been a week before or after the 19th of February, but in NO WAY as early as January 18th.