Menstral Disc?

I just bought some last night to try. I hate tampons because I only bleed heavy enough for them for one day. Pads are SO uncomfortable, but I've been tolerating them for a year or so. I've been reading into the Diva Cups, but they were $40. So, anyways back on Topic... I got some Menstral Discs instead, tried my first and of course it was uncomfortable. Took it out and tried again. The second one was a semi success. It held up, but I had small leaking. Changed it out this morning and I feel like I'm still having small leaking, but I push the disc in as far as it will go. I even push it behind my pelvis bone like instructed. Am I doing something wrong? Or is it normal?