The NaturalCycles app calculates whether you are fertile based on your body temperature. After several studies, the developers claim that the app is just as reliable as the pill.
You measure the temperature under your tongue with a thermometer every day. You enter the temperature in the app, which then calculates whether you are fertile or not. Around ovulation, your body temperature rises by 0.3 degrees. Sperm can live in your body for up to a week, which the app also includes in the algorithm that calculates whether you can have unprotected sex.
Who dares?
If you are considering a switch from the pill to this app, make sure you know in advance how it works. For more information about the app and the science behind it, visit Naturalcycles.com.
