Kyleena IUD and pregnancy

Hi everyone! I’ve had my IUD in place since September 2020, and I have not had my period really since then besides some irregular bleeding but nothing else. However, I’ve recently noticed that I can’t feel my strings. I have also been having period symptoms but I’m not bleeding? My mood swings just started being terrible, and I’ve had terrible stomach cramps and back pain. My boobs have also gotten a lot bigger and more sore. I just noticed these symptoms a couple of days ago, and I am scheduled an appointment with me OBGYN to see if the IUD has moved and if I could possibly be pregnant. Have any of you had any pregnancies or pregnancy scares with the IUD? If so, what were your symptoms ??