I have since bought a Fleurcup. I tried out a couple "dry runs" pre-period. It fit perfectly and I had no trouble with it slipping or being uncomfortable, even wearing it for a couple of hours.
Now today, period time. It starts slipping down right away, lots of over flow, barely any caught in the cup (Diva Cup at least had that going for it) and overall just a big blood bath! I've tried putting it in farther or lower, but I just don't know what I'm doing wrong. I hear people talk about positioning the cup different ways inside, but I don't seem to have a lot of leeway once it's in there. And how would I know what to even try?
I feel very frustrated. I really want to cup to work because of all the benefits and the reasons it is better than tampons. But what else can I do?!?