Wow, 12 pounds in 10 days is fast! I know many have their biggest loss in the first week or two, due to water loss, but that is ALOT of weight! I am not sure how much you have to lose, but do not be discouraged when it slows down! It Is best when it is 1-2 pounds per week, and easier to keep it off. Please try to remember this is a lifestyle change, not a diet. The way you are eating is for life. As a result of the changes you will lose weight and be able to keep it off. Diets end, a lifestyle is for life.
Best of luck on your journey!