Period after IUD removal?

I had the Kyleena IUD removed last November of 2018 due to side effects. Google and my doc said that my period should return to normal after about 3 months of removing the IUD and, well, it’s now July and my period has been almost completely MIA. I’ve taken pregnancy tests and I am not pregnant, I have no idea why it’s taking my body so long to readjust. Has anyone else experienced something similar? How long did it take for your cycle to return? Should I be worried?