See the Related Link for "Pregnancy date calculator" to the right for the answer it says somewhere around April 13th.
The date around which you like concieved is January 4.
Roughly January 12th
January 30-February 9 is as best an estimation as I can conceive.
July 5th
it depends when your due date is
June 4
Early September 2005
The week of May 4th
Roughly August 11th
Since your due date is calculated from information that you gave your doctor, you are the best person to answer this question.
That makes your estimated conception date April 12th 2011. However, this date could be wrong by a couple of days. It also depends on when you ovulated.
Roughly Thursday September 11th 2008