Could starting nuvaring only a couple days before my period stop it totally? or could i just not of had it because i'm pregnant?

Take a test : If you think you might be pregnant check then check a home pregnancy test. They are cheap, reliable and available at any pharmacy. If you put NuvaRing in you would not expect a period until you remove it 3 weeks later.

Get preg test: Although you are probably not pregnant, you must get a pregnancy test. A urine test will do just fine. Starting the NuvaRing right before your expected period would hardly ever stop it. If you started it more than 4 days before, it could delay it though. It is more likely that this period was delayed/ absent due to worry or stress. Stay with the nuvaring. You'll have protection and reg, light peri.