My little 3 yr. old granddaughter had khaki-colored stools for a couple months and the pediatrician wanted to run some blood tests to be on the safe side. Her liver enzymes weren't quite within normal range. The doctor didn't seem too concerned, but she repeated the test in 3 months and everything was back to normal. It was a mystery. Do an internet search and see what you find about stool color. If it continues, speak with your doctor. Better to be safe!
Unless you are having ther symptoms along side these pale stools, i wouldnt worry to much, stools can change colour sometimes for non serious reasons, but if it goes on you may want to get a liver function test done, as it can indicate a problem with your liver.