Conceived ?

I have a math like question for u ladies me and my husband were trying to think of the actual day we conceived our daughter she already is 7 months but we were just thinking what was the actual day because we were having unprotected sex for a while my last period before her was feb 4 th 2015 she was born nov 2 2015  my real due date was nov 12th 2015 she came a bit early can anyone answer my question ? Thanks (: