I started my period when I started secondary school. I was In Denial for ages as I didn't want to grow up. So I never kept track of them and never knew when I would come on.
One day I. English class it happened. There was blood all over the back of my skirt and the chair. I managed to cover it by wrapping my cardy round my waist and fashioning a homemade pad out of toilet paper. Then I shuffled round for the rest of the day.
Needled to say when I have the talk with dd1 this summer I will be making her up a special girls box, full of everything she needs for a few months worth and a calendar to mark the days. I don't want her to have to do that!