I now am on my second month of insertion of nuvaring, am I suppose to wait 7 days to have unprotected sex? I started nuvaring (mar.18th)

Your fine. If you are on your second NuvaRing and you waited no more than one week between rings you are protected and should be protected from here on out even during the week between rings. For more info www.Askyourgynecologist.Org.