How to change your cycle length
How do I change my cycle length?
You normally do not have to change or specify your cycle length. Once you start entering your period data FertilityFriend.com will calculate your cycle length automatically.
If you just started using the service you can enter your initial cycle length (the one used for predictions on the calendar) using the menu Chart Settings/Charting Settings on the desktop site or use the similar Mobile Charting Settings feature.