First User: Are cramps normal? How high up is it supposed to be?

It’s my first time using a menstrual cup and I’m noticing cramping minutes after inserting the cup and I can actually feel the cup inside me when I walk/move and it’s a pretty uncomfortable feeling compared to pads (given I’ve used pads ever since I started menstruating). I was wondering if that’s normal, or if it’s something that will stop once I use it more?

Also is it ok to poop while having it in? Thanks in advance!