Gaining weight while juice fasting! What to do?

Hi everyone,
I have been reading the forum for a while but posting for the first time.
I am on day 13 of my first juice fast. I am not getting any supplements, only adding some Guerande salts in my juice sometimes and had 3 laxative teas all together. I had a Colon Cleanse on the first week and a lymphatic massage yesterday to get rid of all toxins. Also I am drinking loads of herbal tea.
My BMI is 26 so I was hoping I could lose about 15 pounds (I am quite tall). I lost about 10 pounds the first week, but not losing anything anymore for 4 days. Worse than that, I gained 2 pounds since yesterday. Its even more surprising as I had very little juice yesterday and drank tons of herbal tea. Is my body refusing to lose the weight?
Did any of you had this happen before? What should I do to restart the engine? your help is much appreciated :-) thank you.