Umbilical cord??? Please help!!

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I'm totally freaking out! I had my baby 2/13. I went to change her a few minutes ago and her cord is barely hanging there and there's puss underneath it! Isn't it a little early for it to come off? It does smell, but the smell has been there and the pediatrician said to just leave it alone, dead skin smells. I also was told not to use anything on it. 
Please help! I'm a FTM and it's making me panic that something might be wrong.