New engine ratling!!

[jrc90240sx]

Well i have been driving my car for about 3 weeks now. about last week i started to notice a ratle from the front of my car. I looked and couldnt find anything, and it sounded more like it was coming from the engine and not from something loss. it has goten slightly worse over that past 1 1/2 weeks seens i started to notice it. i feel that its either the timing chain, or something in the vavle train that is making the nose. i would like to know any of your guys thoughts, and maybe resons as to why something like this would happen? Thanks for any of your info

Joe