Stool is darker in one area. stool was normal sized and also normal in color. mostly brown but at the end seemed way darker ?

All brown colors: of stool are normal. Abnormally light stools ("clay-colored") may be due to reduced bile associated with liver disease. All dark brown stools are normal UNLESS they are BLACK which suggests upper GI bleeding. Sometimes more or less hydration in one part of the stool may affect its brown color. I wouldn't worry about this any further. Stay well:)