Surgery on 5/5 and Weirdness

I lost 12.5 lbs while on my two week long clear liquid diet pre-op. The first week after my surgery I lost 5.5 lbs. I haven't had any trouble at all really. I have been drinking fluids just fine and I slacked a little bit on my walking this week, but I've been doing alright as far as my liquid diet. 

But my scale is telling me I gained a pound this week. 

It just really seems odd to me that it would happen at this stage. 

Keep doing what you are supposed to do and you will be fine. Weight fluctuates, and stalls the first month are common. Search 3 week stall and you will see. Good Luck.