not losing weight on the master cleanse

The 1st time I did The Master Cleanse was 2 years ago after I breastfed my 2nd baby for over 2 years. I was then 135lbs at 5’4″ and went down to 120lbs. I decided to do it again after 6 months but after 5 days, I only lost 1 pound the whole time now, on my 3rd try and on my 3rd day, I still havent lost a single pound! They say it’s because I dont have any excess weight, but I know for a fact its not true because I gained about 12lbs over the past 3 months (I was 109lbs lbs last Sept and Im now 121lbs-I had to drink antihistamistamines for my allergies plus the “curse of the holidays”.) Has this ever happened to anyone? Im already getting discouraged with the absence of results. (btw,I follow the classic instructions AND havent altered anything in the process. I do the salt water flush every morning and take the tea at night)