Perimenopause no period tracking

The menstrual cycle tracking for women in perimenopause needs improvement.

i was constantly updating the calendar telling it I didn't have a period at the expected time. Doing this tracked when I last had one so that I'll know when I hit menopause. 

Then, for a couple of weeks I failed to do it and now my calendar is gone. I've tried to get it back with no success.

Surely Garmin can accomodate the millions of women who will be in perimenopause at sometime in their life.