Yesterday afternoon I noticed the first sign of color indicating that my period was about to start early... except that when I got home, still no flow... when I went to bed, still no flow... and when I woke up, still no flow. I figured I was just being silly, and wasn't actually starting my period at all.
Still, I today was a very special event (the swearing-in ceremony for a new group of Peace Corps Volunteers... they ggrow up so fast *tear*). So I figured, why not stick in my cup, just in case. I went all day, didn't think about my cup or my period once. When I got home, checked on my cup, and sure enough I had started my period at some point during the day.
Bottom line... if I were using tampons there's no way I could have stuck one in "just in case". I would have been checking up, paranoid, all day. And of course I could have used a pad, but I would have been uncomfortable all day. Because of my cup, I didn't think about my period from the time I left my house until the time I got home :)