Background info: 27 years old, sexually active, no kids, 5'6" and very skinny, very active. Long, narrow vagina with a very low cervix during the beginning of my period, which returns to its very high normal position at the end. Currently using a Lunette model 1, which worked pretty well for the past 4 years or so.
Ideally, I probably need two cups, one for the beginning of my period and one for the end. In the beginning I have always had difficulty positioning the Lunette comfortably without it leaking, because my cervix is that low. Toward the end, my cervix is so high I have to go digging to find the stem when it's time to clean my cup.
Of course, the problem there is that my flow is pretty heavy in the beginning, and I don't really want a smaller cup. It's so light by the end I don't really need a bigger one.
The more significant, new problem I've been having is getting the cup to stay open. I can put it in, feel it open, stick my finger around and confirm it is open, I have even removed it and put it back in just to confirm it was open and I'm not crazy. But after an hour or so of wear, it will start leaking and when I remove it, the side is collapsed back in. This happens at all points in my period.
It would seem I need a firmer cup, maybe narrower? But I'm not sure how that would work out in the beginning of my period, with it needing to sit so low. I have historically had difficulty peeing with the cup in during the start of my period as it is, although that seems to be mostly an issue of positioning. Any thoughts?