Accuracy of dating pregnancy with ultrasound

I had sex with another partner unprotected for the month of Feb - currently.

I had an ABDOMINAL ultrasound on 4/1 that dated me 7wks, 0d with an EDD of 11/18.

This is because it is the longest portion of the embryo’s body and provides an ideal measurement baseline of growth and development.This is the period of time which provides the most accurate assessment.Generally, ultrasounds which are performed in the first trimester are within 3-5 days of being accurate in terms of assessing gestational age.Crown/rump length and gestational age are closely compared with each other until around the end of the first trimester.The ideal time for a sonographer to assess the gestational age in the first trimester is between 7-10 weeks of pregnancy.I can give an "estimate" but I really don't know because I never keep track.

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