My 9yr old son c/o of rt low quad pain. Where his belly button is to his right side of his stomach. What can be causing him to have this pain. No fever?

Could be appendix... The first possibility that comes to mind is appendicitis, which may not cause fever. Commonly, there's bit of appetite loss / nausea, then belly button (umbilicus) pain which tends to move down to the right lower quadrant (mcburneys point). Certainly it could be another problem, and length of time is important. If gone in 24 hours, probably ok; but if persists +fever or becomes severe, c doc asap.
Should Be Seen. Jessica your son should be seen today as there is the potential here for this to be his appendix acting up. Please call his doctor and have him seen today or take to the er or urgent care if necessary.