circular object seen in South Jersey

Will I was sitting in the back of a type of school bus and when I looked out the window across from me ,because I was the only one in the back of the bus, so as you can image I looked up saw a plane and high, like way way way way way way high, up I saw this circular object. Know I know it had to be UFO and it had this circular shape to it and the coloring of it was this brownish sliver-ish color and that I found to be odd. This was in the day light and I may sure not to till anyone elsa it just me that knows about because I know people would have just seen me as a crazy person, so no word will get out about in the area.
P.S. I left my camer at home for the trip I was unable to take a picture of it and this happen at a stop light.