I am using natural family planning. I am using the Lady comp since 5 years and I am super happy with it. It does all the work for me so besides measuring every morning my temperature under the tongue I dont have to do anything. As far as I know its also the only one which was actually clinical studied has an accuracy of 99.3% - good enough for me :). Never got pregnant. I love it.
Alright, thank you all for sharing! I’ll definately have to check out “Taking Charge of Your Fertility”. 