Advice please!

So I have the mirena IUD and it’s treated me wonderfully. Lately though, my periods have been getting farther apart and lighter and lighter. Last month it was light spotting (which is awesome but kindof nerve wracking). This month, I haven’t gotten a period and according to my app I’m 8 days late.

I have no other pregnancy symptoms but I’m still nervous. Has anybody else experienced this? Should I take a pregnancy test? Should I just thank my lucky stars that I don’t have a period?

Any advice would be awesome!!