IUD and Pregnancy

I got my Kyleena IUD in October of 2018. I’ve had a period regularly every month since. This month I am a week late and I have had all the pregnancy symptoms. Sore boobs, nausea, etc. I have taken at home tests but they have been negative. Just wondering if anyone has ever gotten pregnant on an IUD and it not show up on a test? I plan to get a blood test within the next week just to be sure. I currently have a one year old and all my symptoms are lining up with my first pregnancy. Thanks in advance!