If my due date was given to me as April 11th 2009, when was my conception date going off the due date alone?

I cannot go off LMP only my Due Date so please let me know any possibilities.

ESTIMATES

Day of your last Mentrual -Saturday, July 5, 2008

Conception Occurred – Saturday, July 19, 2008

First Trimester Ends -Saturday, September 27, 2008

Second Trimester Ends – Saturday, January 10, 2009

You are : 6 weeks preggie.