For the last several weeks my stools have been white? what could be causing this?

Maybe gall bladder: Biol starts out at dark green color and then changes to browned as it passes through the intestines. If nobody leaves the gallbladder the stool maybe a more pale color. It also could be a change of the bowel flora, or a disturbance of fat absorption in the intestines. See a doctor and they will probably want to do some blood tests. It might be helpful for you to take a picture of the pale stool.

Clay color bm's: White stools suggest that bile is not getting into the intestinal tract and this may be due to blockage from stones in which case the urine would be brownish. Greasy pale stools are seen in pancreas problems and malabsorption problems like celiac disease. In short, your physician or gastroenterologist should examine you and order the appropriate tests.