I've lost 2 pounds since Thursday also, but I have kept it off. I actually lost another 1/2 pound this morning (I have a digital scale). I do not have water weight gain because I have been on a modified Atkins (lowcarb + lowfat) for a month.
I have been on the treadmill twice since Thursday and swam twice as well.
I have had a small bit of side effects but it should go away after a couple of days. (I have taken Orlistat 120 mg. in the past and the side effects were temporary)