Urgent - On day 18 of cleanse and no weight loss last 2 days

This is my first cleanse. I am on day 18 with a goal of 30 days. I am following The Master Cleanse by the book. Only thing I haven't done is 6 glasses of lemonade per day, I usually have 4. I didn't lose weight until day 6 and have only lost 13 pounds total. I started taking armour thryoid on day 4. Any ideas????