Xray report write "it could be distal uretric calculus" & "normal bowel gas pattern"?its just a stone or something else?what normal bowel gas pattern?

Yes and normal: A calculus is a stone. Uretic would mean in the ureter which is the tube that moves urine from the kidney to the bladder. Normal bowel gas pattern describes the location and character of gas inside you stomach, small and large intestines. Abnormal patterns can give clues about obstruction, poor movement of contents (ileus), constipation, etc. Your's is normal.