One of my brackets came loose, do I need to get it fixed and why are my braces so close to the gum?

So today I got braces for the first time; I have braces on both jaws and elastic bands at both ends to bring my upper jaw backwards. I haven't experienced too much pain or discomfort, but a couple of hours ago I felt something move in the braces and I had a look and one bracket by the middle lower teeth had flipped over and come loose. Do I need to get this fixed and how urgently? I also noticed tonight that my braces are bordering on the gum line...Is there any way to prevent gum irritation?

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