I've been using Nuva Ring for about a month and a half. The last time I had my period was the first night I was SUPPOSED to insert the Nuva Ring. The RN told me to remove the ring in three weeks in order to get my period, but I haven't since. I was thinking maybe I would get it after I put it back in the next week. It makes no sense. So for the past two weeks, all I do, is wait for my period. What could this mean?