Do any of you women out there take Nuva Ring instead of the pill?

I have been on Nuva Ring for years and have had no issues… until now.

Over the summer, the ring fell out during sex… I didn’t know until I went to take it out like 2 weeks later and it was missing (my ex later found it under his bed). Now, in the past week, it has fallen out twice while having sex (and I’m not talking anything rough or crazy). The first time, I realized and put it back in (I know it’s okay for it to be up for up to 3 hours at a time) but yesterday, it apparently fell out and I didn’t find it until this morning. Naturally, I was a little concerned about getting pregnant, but now I am confused as to why this is happening (of course my doctor didn’t want to offer much advice over the phone).

Have any of you had this experience? Any advice?