Worried

I have had braces since November 2022 and will get them off in January next year, I have been brushing my teeth very well twice a day every day for those two years, but I have been eating a good amount of lemonade/ Coca Cola and candy and am now really worried I will have brown spots on my teeth

Has anyone else eaten/ drank fizzy stuff and was okay? I’m worried and wish I hadn’t

Is there anything I can do if I DO have brown spots on my teeth?