It sound like you're not getting enough fiber. This happens to me too later stages in a prep, especially when you're not eating much. Boiled potatoes, strawberries, bananas, chicken, the foods you mentioned, no fiber. Make sure at least a few of your daily meals contain fibrous veggies. I always have peppers, onions and asparagus with my eggs in the morning, broccoli with lunch and dinner, spinach, etc. Also a fiber supplement like psyllium husk 2-3 times a day will really help, I do twice a day, once before breakfast and once before dinner. 3 out of my 5 daily meals contain 6oz of veggies each. After a few days of more fibrous veggies and a fiber supplement things should normalize.