Hello and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. If you weren t using nuvaring for more than a week and had unprotected sex there is chance that you would have conceived. Get a pregnancy test done before you insert the ring back again. Nausea due to the ring is usually seen soon after insertion not after removal. Next time use post coital pills as a back up when you are not wearing your ring. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Deepti Shivakumar