my wife arrived from a 1year vacation on april 26,08.and on that day of april 26 we have sex and almost 5x a week up to may 20.her last menstrual was on april 20 and on may 21 she told me she thinks shes pregnant.we went to a doctor on may 25 and confirm that she was already 5weeks pregnant.the doctor told us her due date is january 30,10.am i the father?