Ultrasound dating accuracy early

I discovered I was pregnant unexpectedly, and went to have an ultrasound on May 23rd.

Before you consider abortion or seek an abortion clinic, it is important to know how many weeks pregnant you are (the gestational age).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.But early ultrasound due dates have a margin of error of roughly 1.2 weeks, so doctors will usually keep the original due date (the one generated by the date of your last menstrual period) if the ultrasound due date is within that margin of error.If you can't remember your last menstrual period date or if you have consistently irregular cycles, the doctor can use an early ultrasound to give you a fairly reliable due date.

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