I used to have the Kyleena, I had such sore boobs and nipples all the time it is possible it’s ovulation but because you have the iud the chances of you getting pregnant are very very slim to none, also you may not have ovulated before this it’s very hit or miss if it will stop you from ovulating because it isn’t its main source of function (it works primarily by keeping the lining of your uterus very thin and makes your cervical mucus thicker and also just the fact you have a plastic thing inside your uterus)