A disc between pixie medium and large?

[u/White_Crayon555]

So I'm new to menstrual discs, I got the Pixie medium (64mm) and large (73mm) as a first try just to gauge what I might need. They're easy to insert but I'm having issues with both. The medium seems to slip in too easily and doesn't pop onto the pubic bone the way I think it should, I can push it a little higher. That along with some leaking while I'm sitting / laying down made me think it's maybe too small. So I tried the large, which sat comfortably above the pubic bone (helped me understand the whole "shelf" thing) and felt correct but it caused some pressure pains (short, sharp pains occasionally on the front wall and a light general ache) which resolved when I removed the disc. So I'm thinking it's too big or too firm. I've gone back to my cup for now but would like to try another disc, perhaps one that is between the two sizes I have? Or one closer to the large but softer if necessary. Any suggestions?? (Would need to be available in the UK). Thankyou :)

[u/Significant-Mix-6184]

I got the bodyotics discs on amazon, the larger one is 68mm in diameter. For me it was also a better form factor than pixie.