I took Nuva ring out on 9/27, Period started 10/1 lighter and shorter than normal, ended 10/4. 10/10 started sore breasts, cramps lower right & back?

When in doubt. just check pregnancy test. And if you are still not bleeding normally and first pregnancy test was negative, check it again in 1 week. You just came off a period which was likely rebound from NuvaRing removal. But breast soreness certainly cannot be ignored.