Is this normal to gain wght 3/5 mos post op?

I'm about 3.5 months post-op RNY, and as of my doctor's appointment last Wednesday, I'd lost 90 pounds. I usually weigh myself once a week on Monday morning. This past Monday, I weighed, and hadn't lost anything. I figure, no big deal...plateaus happen. So just to see if I'd lost anything over night (I've heard where some people lose a couple pounds overnight or during the day, for some reason) I weighed myself Tuesday morning. Nope, still stuck. Well. Bad me :( I decided to weigh myself AGAIN today, only to find that I've gained 1.5 pounds! I think this is my first offical plateau because I've lost pretty steadily until this point, but is it normal to gain weight on a plateau?? I'm trying to think of things I've done differently over the last week, but I really can't figure it out. I did buy an exercise ball on Saturday, and have been doing some toning exercises, trying to work on my thighs, butt, arms, etc., but nothing strenuous or vigorous. I'm eating and drinking the same amount that I always have. Anyone have any idea what this could be? Please help!

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