If I'm due on November 27, 2011 and the first day of my last period was on February 14, 2011, which day did I get pregnant? February 4th, the end of February, or March 5th?

If you are concerned who the father is you are going to have to get a paternity (DNA) test done.

However, with that said, if your first day of your LMP was 2/14, I have estimated your due date at November 21, which would mean that you conceived on or about February 28,