Kyleena IUD, 40 days late

I’ve had my kyleena iud for almost 4 years now, periods/cycle have been mostly regular but all of a sudden my period has disappeared and I’m 40 days late. I took a test 2 weeks after I was supposed to get it and it was negative. Wondering if this has happened to anyone else with this iud, or if you went to a dr and were able to get to the bottom of this??

Would also like to add that I have ovulated twice since then.