Dive cup too far?

I recently purchased a diva cup and it's my second day using it. I keep getting worried it's gonna go too far up because I can only reach maybe the tip of the stem. I'll do kegels and I can pull it out after, but I'm worried because I've heard stories of women getting it stuck to their cervix and it hurts and you need to get it removed by a doctor. Also I'm experiencing a lot of leakage. I hear that if you have leakage it's up too high but I can't get it to sit any lower than where it's at for longer than maybe 10 or 20 minutes. Does anyone have any advice or can someone maybe explain how high it should sit? Maybe tell me why it's leaking or how to get the diva cup to sit lower? Any advice or tips would help.