Gut health while fasting

I just completed my first 20 day fast and it took a few weeks for my gut to recovet. Before that i had done 2 14 day fasts. My gut recovered quickly from the 14 day fasts. I took prebiotic fiber and probiotics after the fasts. I was careful about what i ate. I like to reset my gut biome to get rid of carbohydrate cravings. It usually takes me about 8 days to do that. I was wondering if i took some prebiotics and probiotics after 10 days if i would loose out on anything? I have some prebiotic pills with 1 gram of carbs. I should be able to stay in ketosis and autophagy. I love fasting and would like to do a 30 day fast next year. I am concerned about my gut health. After 10 days I was thinking about taking 1 prebiotic pill and probiotic pill per day to take it easy on my gut.