Diva Cup no longer fits

Ana
I have a model 1 diva cup and after much trial and error before my period, I was able to get it in perfectly the first try on the first day of my period. I had no problems throughout the day and woke up the next morning feeling great. 
However, on the second day of my period, I inserted the diva cup in like I normally did and at first it was fine until an hour or so and it began to hurt. Somehow the opening of my  cup angled itself to the left and the stem was no longer pointing straight so I had to dig a little to get it out. 
I tried putting it back in and it kept feeling like it was slipping out or it kept hurting the left side of my vagina. 
I have no idea what happened. The cup feels too big and stiff now. 
Has anyone else had this problem? Which menstrual cup on the market is softer and not as big as the Diva Cup?