But over the last six to eight months, I have been having a heck of a time with it. The first day is fine, all is right with the world. By the second day, the thing rarely ever opens once inserted.
I have tried cleaning and drying it, making certain the vent holes are clean, using lube to re-insert and even trying new positions.
It does seem to me that my cervix lowers after the first day, but that is about all I can tell.