I just got an IUD yesterday and I'm still trying to get used to it. I feel like I have to be careful or something. If one is not pregnant, does the uterus move (aside from contracting)? The fact that my cervix moves makes me feel like it'll tug on the strings and pop it out (is that even possible?). I guess I'm just wondering how the IUD stays in place. I'm paranoid as hell, and I feel stupid for asking these things.