The first day of your periods must be entered so that the algorithm can give you a result. You can enter and/or edit your period in the calendar or in the journal. To do so, click on "Yes" in the menstruation section and then select the intensity of your flow. In the calendar you can enter or delete your period by tapping on the corresponding day. It is important to click on "save" at the end in order to apply the changes and avoid accidental inputs.
If you want to edit your menstruation, please note that you can only change the beginning and end of your menstruation.
Note: Please remember to always enter your period correctly for best results. A new cycle can be started from the 20th day of the cycle at the earliest. Also note that your period can only be edited 3 months back.