everyone is different...
before i really watched what i ate and gave in to every TOM craving, i would bloat up 4-6lbs prior to my TOM but lose it by the end..
NOW i pretty much stay the same and then still DROP at the end of my TOM, sometimes up to 4lbs. i love my TOM now .. its when i lose most of my weight for a month
(i've been losing, on average, 8lbs a month)