Usually ob/gyn's calculate the due date from the first day of her last period. Somewhere between the 16 or the 20 of February. Depend on when she ovulated, length of monthly cycle and the first day of her last period.
The approximate date of conception was February 27th 2009
My due date is July 4th 2009 and we conceived October 11, 2008.
The approximate date of conception was April 8th 2009
The approximate date of conception was March 4th
Roughly Friday January 30th 2009
Roughly Wednesday February 4th 2009
Roughly Friday December 25th 2009
The approximate date of conception was January 2nd 2009
http://weekspregnant.co.uk/conception_calculator.html
around march 21st
Roughly Wednesday May 7th 2008
The approximate date of conception was August 29 2009.