Still no AF

Jessica

So I am 12 days late. I’ve taken multiple tests and all negative. My last period ended dec 26th. :/ now I had gotten off of NuvaRing in September. Had an after bleed, then nothing for October, and November. Had my first real period December 21st-26th. And since then AF has been mia. 🙃 I’ve had cramping and back pain off and on since my period ended in December. Like af cramping nothing unbearable. So my question is could the ring still be the reason my period hasn’t returned again? Even though I had a period in December? Probably a dumb question lol ANY advice is helpful.