we tried for 7 months. I have an app on my phone called my days where I track any time of the month symptons, period and temps. We started taking his and her pregnecare conception (amazon) and we used OPK sticks also from amazon. First month trying with Pregnecare and we fell. I also made a word document ( I know!) where I tracked the symptons on which day of my mesntural cycle and how long my luetel phase was, I knew pretty early on something was different this month as my luetel phase is always the same and this month it wasn't. Hope this helps.