I got an ultrasound and I was about 16 weeks and 4 days pregnant which made my LMP of being December 5th and my conception date December 19th.They did tell me that it could only be off by 3 days. I was with guy 1 on the 19th and the 23rd of dec. I was with guy 2 on January 9th/10th. How possible is it for guy to be the father?

Remotely, but not impossible. Calculating conception is an inexact science. I'm surprised they felt they could pinpoint it to within 3 days. Normally they will give a date +/- 2 weeks. Even then Guy 2 seems remote. But I don't think anyone can tell you positively that you can rule him out. Only a DNA test after birth can do that.

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Originally Posted by ScottGem

Remotely, but not impossible. Calculating conception is an inexact science. I'm surprised they felt they could pinpoint it to within 3 days. Normally they will give a date +/- 2 weeks. Even then Guy 2 seems remote. But I don't think anyone can tell you positively that you can rule him out. Only a DNA test after birth can do that.

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It was more than 2 weeks though.

That's why I'm saying its unlikely, but no one can state with 100% certainty that it isn't guy 2.

My period has been really irregular because I've been on and off the pill. My conception date landed on dec 19th which was the exact date I was with someone but I also was with another guy jan 10th.

My question is how likely could it be guy 2? I am aware that it is unlikely but not 100%.

And from experience of girls is your conception date usually right on or in the same week?

Conception dates is estimates, ( educated guesses) And the answer is, depends on what data and how the date was estimated, did the doctor give you that date ?

But yes it is possible,