Anathema

Hey guys. I've just searched the forum to see if this has been listed before and I couldn't find anything. I have a GTS-T and when I accelerate whether it's gentle or not. I get a ticking noise coming from what sounds like rear right of the engine. The ticking increases in speed with revs.. I have no idea what it could be. It started after I drove on some gravel....I heard some rocks flicking up into my under-carriage. No Idea if this could cause it : / Help me please!!!