Skyla IUD

Hi guys, I’ve had my skyla IUD for a year and I’ve noticed my periods are just not starting to get shorter but before I got my IUD I never had cramps and now I have the worse cramps eveeeeerrrr! Also I never check my strings anymore because I couldn’t find them after a while.. so I’m hoping everything is okay. During sex if my boyfriend goes to deep or is I’m in a certain position it hurts really bad and idk if that’s because he hits my cervix and it’s in my cervix or what? Also sometimes when I sneeze it hurts on my right side if my uterus and I’m not sure if that’s okay but I’m worried it could be imbedded in my Fallopian tube or somethinf dangerous... I’m just scared and would like reassurance.. is this pretty normal?