How accurate are Ultrasounds?

[kimm25]

Last time I had an ultrasound was on November 18 and it said I was 6 weeks and 6 days...My Last menstrual cycle was on October 1st... Can you based that to know when you conceived?

[AnnieBrooke]

It sounds like you conceived on or around the 15th of October.  At 6 weeks 6 days, the margin for error would be pretty small, maybe +/- a day.  You can't use an ultrasound to replace the need for a DNA test if sex with two guys was very close together, but getting an ultrasound this early is very helpful.

[kimm25]

They based it of the measurements

[kimm25]

yes correct!

[AnnieBrooke]

They didn't give an ultrasound when you first went in, but then you did have an ultrasound on November 18 and were told by them that you were 6 weeks 6 days, from the measurements of the embryo?

[kimm25]

Yes the first time I went in to confirm I was pregnant. But they didn't give an ultrasound. They just wanted to check..

[AnnieBrooke]

You can give a pretty good guess.  You say the last time you had an ultrasound, you were told you were 6 weeks 6 days?  Does that mean you had an earlier one also?