Start tryin as soon as u finished ur period. I had sex on the 5th day of my period, I thought I was safe and continued to have sex upto the 9th day...wasnt tryin to get pregnant, nd I was so sure of myself that I wudnt get pregnant cuz I had sex on my supposed safe window, I missed my next period nd when I tested, it was positive...was so shocked.
Or u can JUST download an app called ovulation calendar and based on your period it precisely tells you THE days your fertile when your ovulating etc. Worked for me.LOL.I would definitely recommend it.
Best fertile days vary from woman to woman. Ovulation predictor kits can help you pinpoint the best time for you.
Good luck!
I believe 7-14 days after ur cycle.