I took the nuvaring out on December 10th and had a period starting Dec. 12th. I didn't put another one in because we are trying to get pregnant. I was supposed to start my period on Jan 9th, but still haven't started. I took a home pregnancy test yesterd

Not to worry. You can wait up to a month for your period to start, after that might check with your doctor just not to waste time. You got cutoff, I assume you mean your hPT is negative? If no period early February consider hPT again. Good luck.
Repeat the test. Your period could be late because you just stopped the Nuvaring or because of pregnancy. Even if the pregnancy test you did yesterday was negative, if your period still hasn't started, repeat it next week. Hope this helps. Best wishes.