Lighter Period After Over 1 Year of Having Copper IUD

Daisy

So initially after having the iud inserted my cycle was all

over the place, it eventually went back to normal, and even got heavier. But for the past couple months it has gotten lighter. My most recent period was 2 days shorter and. and started a week early, but my last period was a solid week of moderate spotting. Has anyone else experienced this?

Could it have to do with stress or potential illness?