So I just got an instead cup and I am trying to get the hang of using it. Right now, the problem is that it keeps slipping out and leaking. I insert it by "hooking" it behind my pubic bone like everyone says, but I don't understand how it stays in place back there... Even after hooking it around (what I think is) my pubic bone, while sitting on the toilet and contracting my vagina I feel it move out of place a bit. Maybe i'm not pushing far back enough? The cup is fine for 1 or 2 hours, and I'm dry and everything until I suddenly feel a rush of blood running down my leg from the cup moving out of position, and sure enough in the bathroom I can feel the cup has slid down almost to the opening of my vagina. I don't understand how people can claim to excersize wearing these! Is it that my pubic bone isn't long enough to keep the cup in place? I've also heard that the cup doesn't work with "smaller" vaginas. I'm sort of a small person I guess (5'3, 100lb), but I've always worn super and super plus tampons comfortably. I really like the idea of the instead cup and I want it to work! Help!