Type in the question "when am i ovulating calender" into google and there are alot of sites that you can put in your menstrual cylce and last day of period or other things and that should help you figure it out.. Some site will even figure it out for you.
Fom whut i know thought right around twelve to fourteen days before you next period is when you are ovulating.

Determining the gender of your baby is very unreliable.

Sex on the day you ovulate and one day before - Boy
Sex before this - Girl