Ay, based sa dates mo, if you're 8 weeks and 6 days na ngayon, you got pregnant around late June or early July, so September fertile window ay waaay after na, you're already past that! Kung gusto mo talaga malaman exactly kung kailan ka nag-conceive, better ask your OB sa next ultrasound niya kasi sila ang makakapag-pinpoint ng exact dates based sa baby's size, eh!