2nd KUB result

So I got the result of his 2nd ultrasound in the mail today. It says:

Findings: The right kidney measures approximately 5.23cm, increased from 5.15cm on the previous study.The left kidney measures approximately 5.22cm, increased from 4.95cm in the previous study. A small amount of fluid is seen within each renal pelvis. There is no dilation of the calices. The proximal ureters are not visualized. Color Doppler blood flow is present within both kidneys. No perinephric collections are seen. Bilateral ureteral jets are identified. There is only small amount of urine within urinary bladder.

Impression:
1. Interval renal growth, as above.
2. Trace fluid within the renal pelvis,bilaterally. No caliceal dilation is identified. The kidneys are not grossly hydronephrotic and this could be related to normal urinary excretion.
3. Bilateral ureteral jets exclude ureteral obstruction.

If I remember it right, the urologist said that if the fluid increased more than .10mm then his kidneys needs to be monitored and there is tendency that he needs to take antibiotic. Based on the result above, his right kidney increased .08mm, his left increased .27mm. His left kidney increased alot of amount :( But the urologist said that he don't need to take any medicine as usually, this kind of case resolves on its own. Oh God! I really hope so.