I've never been able to turn my diva cup, but I can feel it pop. It just took a couple (three I think) cycles before I was able to really know. Most of the time it takes 10 or so minutes after I get up to pop and then there's this "pop" in my vagina and I know I'm good to go. Rarely do I get it to seal upon insertion. It takes patience. I got it in the summer, and this is the first cycle where I've had no leaks at all. But, it was SO worth the trial and error. If it wasn't for the cramps I would completely forget my period existed with this thing :)