Diva cup slipping??

Kirstyn

Any advice/insights would be greatly appreciated!! I have wanted. Diva cup for a while and finally got one for this period. This is my first time using it and I noticed after a little bit I feel it slipping down. Like I notice the stem and can feel it at my vaginal opening. Did I insert it wrong or not fully rotate it? Wrong size? Please help! It makes me worried about being able to exercise while wearing it.