Is your cup really supposed to be round or almost round once fully open inside? I can't seem to make mine more than a slender oval even when it's expanded. I ran my finger around the rim, which is really challenging with the cup taking up so much space, and it seems open. I even heard the air rush in. It's my day off and I'm sort of afraid to leave the house for fear of not having a good seal and leaking everywhere.
I don't know if I should continue trying, but I'm irritating the crap out of my ladies parts as is. It's a bit discouraging =(.