vaginal ring

Megan
So I've been on nuvaring for about 2 years now. I love it. I don't have to worry about remembering to take a pill. My insurance covers it. And I've never been pregnant. That's an all around win for me. 
One thing that I have noticed is that after I remove the ring it takes anywhere from 2 to 4 days for my period to begin. Has anyone else experienced this? Anyone have an explanation?