Should I put my retainer on now?

I had braces for two and a half years. My tooth right next to my front teeth is loose for more than 4 months after getting my braces removed due to bone/root loss from all the moving around. I haven't worn my retainer in two weeks and although I can put on the retainer, it hurts. I'm worried that if my retainer will move the loose tooth more it will become more loose, resulting in me loosing my tooth.

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