Concerned about my recent medical diagnosis

Hi guys I’m Hayley and I’m 27 nice to meet you :) Recently I went to the emergency room for (turned out to be a kidney stone😅) and while I was there I had a CT scan done and was informed by the doctor that I had a 2.7mm lining around my uterus and it also had an abnormal shape to it.. Then I followed up with my doctor and is having my in next week to get an ultra sound saying instead of a lining around my uterus, there could be some sort of liquid tissue or something built up inside my cervix. Does anyone have/had anything like this go on with them before? I really don’t know what could be going on or why this is happening so really any information you have would be very helpful!