Nuvaring

I started the nuvaring on June 12, 2018. I was supposed to get my period two days ago. I’ve only been on the ring for a week, is it going to delay my period or stop the blood at all? Because I’ve been cramping since the day my period was supposed to start. I’m just a little confused is all. I’m not pregnant, I got tested for it when i was put on birth control.