Do I need a bigger size?

My Diva cup size one always leaks. I’ve tried wearing it high, low, and in between. I always make sure it has fully opened and that my cervix isn’t on the size by running my finger along the top after insertion. I know the leaking isn’t just residual blood left on the sides after my cup is put in because it’s a lot, enough to effectively ruin my underwear and sometimes my pants as well. Pretty much every suggestion I can find on the internet to stop leaks I’ve tried. I’ve never given birth or had a living baby but I have had a D&C; procedure and a manual vacuum aspiration procedure following complications from the D&C.; Am I doing something wrong or is it just too small in diameter?