Hi,
Welcome to ehealthforum,
If you had been on the Nuvaring for a few months and been regular with its use, then being sexually active during your week off the Nuvaring use will not result in pregnancy. If you have put in the next Nuvaring within 7 days of taking the last Nuvaring, then the protection will be continued. Remove the Nuvaring at scheduled time and wait and watch for your periods. Avoid stressing out, as it can also delay your periods. If periods are missed, or abnormal, or if you develop nay other new symptoms, visit your doctor/gynecologist for further evaluation, clarification and assistance (and to confirm/rule out pregnancy chances). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.