Diva cup help!!!!

Natasha • Mama to a little boy born 09/18/15
Today is the first time using my diva cup. It's sooo weird!!! I have no idea if it's opened all the way or not. Is it supposed to feel like a tampon? I started cramping after putting it in, but they are fading now. Is this normal?!?! Anyone who has experience please let me know!! Thanks!! :)