I am a healthy, 22 year old and was on NuvaRing every month since January of 2007. I took it out in August, and 2 weeks later I was pregnant (first pregnancy). I am now almost 13 weeks. I also wanted to say, I started prenatals prior to TTC, to help get my body ready.
I didn't really chart- but i used one of those ovulation tests, first time I used it, it said I would be ovulating in the next day or two; and sure enough that morning I felt pain in my side (I can feel when i'm ovulating).