jojo, I'd reccomend joining fertility friend and getting the hang of that. Buy a BBT - basel body tempreture - thermometer and start temping every day at the same time, after 3 hours sleep at least, but try and do it on the dot every morning before getting out of bed, drinking or anything. This will show you when you have already ovulated so unless you check your cervical fluid and cervix as well you won't know untill you've actually ovulated, so use OPK's if you want to pin point ov to be sure to catch that eggy. There is lots of advise and different methods people use for opk's, I find FMU best for me (everyone is different) and before I became pregnant my cycles regulated to ov on CD21, at first I used the opk's from day 10 or so and then every day untill I saw a darkening line, I would then use 2 or 3 a day to be sure not to miss surge, once I got + I'd ov the day after, confirmed by a tempreture rise the next day.
Good luck with however you choose to go forward and I hope this helps a little