I already try before that ovulation test kits I buy inline.and when ovulate will show double lines but tried before also failed.i dont know what the problem?in kits they show I was ovulate n we had sex but the next month period come..failed.and I stop use it.i try download ovulation calander apps I m using sony xperia phone android also.before my period irregular last month my period start 15/4/15 ...this month is 17/5/15..that day same with calculate by ovulation apps here.
I use opks because my periods are a little irregular sometimes, I use those because all you have to do is pee on a stick everyday and they let you when to have sex and when is your highest time
If u have an iPhone try downloading the fertility friend app it has been helping me I take my temp with my bbt in the morning and record it with the app there's also other things to record but I haven't started using my opk tests yet. Have u ever done internal exams daily to check your cervix?