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Yes, my weight always goes up 2 lbs. over the course of a day, unless I am in a phase like I am now, (or I am running, which keeps my weight stable much more than cycling) or I do a hard, but not too long ride. As with others, very long, hard rides make me gain weight, but it's temporary. In fact, over the course of a day, I can almost feel if it is a day when I am losing or my weight will be down the next day.
I don't count calories. If I ate 1200 calories a day, I am not sure if I'd survive. I've seen formulas that say I should eat something like 1100 calories a day to maintain my weight

. Realistically, I think I eat about 2,000- 2500, with exercise, of course, and now I might be eating 16- 1800.