just to clear up something, when you are on the week that you take your nuvaring out, you are actually "unprotected." If you have sex without a condom and just use the pull out method during that week, you are at risk of getting pregnant, pre-cum actually contains sperm. that's just a word of cautious for next time.
But it's best to take a test on the day of ur period w/ first response, but preferably a week after you miss your period <-- i believe that's right, please correct me if i'm wrong.