Conception date

[Blove22]

My lmp was February 22. I was intimate the 27th then again in March 6 with another guy. On March 21 I took a a clear blue hpt with the weeks estimator saying 1-2 weeks. Would that mean I ovulated somewhere between the 6th and the 8th? I had my first ultrasound on May 11 giving me an edd of 11/28 making me 11w2d. All of my ultrasounds have been consistent with the same due date. So my question is when do you think I conceived? Do you think I'll need a paternity test?

[AnnieBrooke]

I tend to think the March 6 person would be the dad, but yes, you do need a paternity test.  It's pushing the edges of the timing that sperm can last in your system from February 27 to the point where you would have ovulated (which my calculator says is around March 7), but it is only fair to all the people involved to never have to wonder in the future.  Not only to both men, but to you and to your child.  If you use a drugstore test, stay together from the point you do the swabs and put them into the envelopes to the point you (yourself) mail them, don't open the door to cheating or suspicions of substitutions.  Test with both guys.  If you need the test for child-support purposes, go to a lab certified by the courts, a home test won't do.

[Blove22]

I know this might be tmi but I know for sure the first guy didn't finish in me, it was on me. But the second guy did. Would that make a difference?

[AnnieBrooke]

Not enough of a difference.  It sounds likely that the March 6 guy is the dad, but the earlier guy should be ruled out with a test, not just with wishful thinking.