One of my brackets came off. How Long would it take for my tooth to be re-straightened? (photo)

Not sure when my bracket came off but I just noticed recently that one of my front teeth is crooked unlike the other which is straight. I'm supposed to get my braces off in September so this is kind of unsettling. Just wondering how long it would take to repair this and should I keep on using my bands or would that mess up my teeth further. (Haven't been able to go to my orthodontist yet, still trying to get an appointment)

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