When did you conceive if due date is 24th April 2011?

To calculate the approximate date of conception, we can subtract 266 days (the average duration of a human pregnancy) from the due date.

24th April 2011 - 266 days = 31st July 2010

Therefore, the approximate date of conception would be around 31st July 2010. Please note that this is an approximate calculation and the actual date of conception may vary slightly.