Any tips from flex/disposable cup users?

Je

I bought a box of disposable cups (not flex, but it's the same thing, just pink🙄) for various reasons, one being the pro of being able to have sex with it in (vs the diva cup and other similar) and it leaked intermittently/did not sit right the whole week🙄🙄🙄. My flow was crazy heavy DT switching bc, but I'm wondering if it will just never sit right for me. I've been told my cervix is is a weird place? Wondering if this might be a factor. I also use the nuvaring, which I have to reposition frequently, but I don't mind much since it's not spilling a table spoon of blood in my underwear 😬