Period 13 days EARLY?

Savanna

So, ladies, I need some advice. My last period was 16 days late, lasted a week. And today I just started it again but I'm 13 days early. I've always had regular periods. I've been on the copper IUD birth control for over a year now my periods had been regular for a while but now all of the sudden they're super out of whack. What's going on?