Not TTC but Nuvaring help

Okay so bear with me. I started nuvaring about a month and a half ago, had my first period on it. Went well. Now I'm a week away from my next period, and I'm cramping like I did when I was pregnant with my son. I feel it both where my regular period cramps are and in my back. With my first period, I had NO CRAMPS. At all. Well it dawned on me today that all I have been wanting is Chinese food or Coneys. Constant headaches, I'm more tired, cramping differently and I'm moody and snappy. But that's the only things I'm feeling. Could I just be getting used to this new birth control? Or should I take a test? I should also add that my fiance and I do it quite frequently with no protection. I'm trying not to think too much into it, but I've never felt period cramps in my back. This is just totally different.