Do Diva cups Stretch your vagina?

I use pretty small tampons, and I do kegels a few times a week. My bfs dick is 9 inches, we haven't measured the width but its pretty thick too. We have a LDR so we only see each other every few months.

I want to try a diva cup but I'm worried that it will stretch the deep part of my vagina and i definitely don't want that to happen. Has anyone tried menstrual cups, and if so did you feel like it stretched you at all?