I say buy a ovulation kit. They tell you when you are fertile and are quite accurate.
Otherwise, if its to try for a baby, try having sex a few times a day all month hehe

Hi there,  If you know how long your cycle is every month you count backwards from the first day of your period 14 days.  Just say you have a 30 cycle each month you will release an egg on day 16.  Also sperm can live inside you for up to 3 days so you should be active from day 13 just incase you ovulate a little early as the egg only lives for about 12-24 hours so it's good to have sperm waiting.  I hope this makes sense to you.  Sorry for being so graphic.  Goodluck.

Ovulation kits are the way to go,if you can't afford them,you start ovulating around 9-10 days after your period.Take note of your discharge,it usually starts cloudy then gets stretchy and like eggwhite(sorry for the graffics LOL)They say youcan fall pregnant in a 4-5 day time frame.You could also take your temprature each morning you should see an elevation,it is tricky though as you only need to be a little under the weather for their to be a change.But you can only try.Have fun and go forth and multiply

Hi just letting you know i didnt know much about my ovulation until i had 3 girls and tried for a boy, (I got my boy by the way) i cheated and bought the ovulation kits from the chemist, and it let me know if i was going to ovulate within 36 hours. It is usually 14-16 days from the start of your period, but remember everyone is different.