I Found Out I Was 9 weeks And 3 Days April 10th And they Said My Due Date Was November 10th. To Be Quite Honest I Don't Remember My Last Sexual Encounter Although My Last Menstrual Period Was Beginning of February and then again I Had a Light Period February 19th Or February 20th . When Did I conceive ?

Dates are all merely best guess as the whole pregnancy cycle is not hard and fast, so unless there's a potential issue concerning paternity the actual date of conception is meaningless.

With the dates you provided, conception likely occurred around mid_February. However, as Curlyben said, there is no way to know the exact day, so if paternity is in question, and dates are close enough, you will need to have DNA testing after baby is born.