when exactly do you ovulate and how long do you have to have intercourse?

Hi - each woman has a different cycle and ovulates at different times. You may be interested in trying our Clearblue Ovulation Tests which will help you determine when you're ovulating!  Here's more info I think you'll find helpful:http://www.clearblueeasy.com/ovulation-tests-and-fertility-monitor.php

Thanks so much and best wishes on your journey!