If you don't know how to calculate your menstrual calander , I have all the time to teach and give you tips to manage your period
Girl, you better stop now don’t click on another app because honestly, it’s gonna get you nowhere on organized calculation your menstrual cycle is not even a calculation. It is a patterned guest, but it can be changed to any moment mother nature likes to keep everyone off guard for surprises and changes so!!
Your cycle probably won’t ever be perfectly regular, and that’s normal. Instead of stressing over apps and calendars, just keep a simple record for a few months to see your general pattern. If you’re concerned, it’s better to have a doctor look at your cycles and give you real answers.