NuvaRing or Am I Pregnant?

I started using NuvaRing 3 weeks ago but I inserted it the week before I would typically get my period. This Sunday started the week I’m supposed to take it out & I took it out but it’s almost Wednesday and I still haven’t gotten my period.

In mid May I had a pregnancy scare but took a test at a gynecologist’s office and it came back negative. Is it possible I tested too early and might actually be pregnant? Or is it just the ring causing me to skip a period?