17 lbs lost in 2 weeks..WTH?

Ok, WTH! I have lost 17 lbs in two weeks. My surgery is tomorrow and when I started my pre-op I was 251.5 and this morning I was 234.5. Is my scale broken? 17 lbs...is that even possible? I guess I have been holding on to massive amounts of water weight? I guess I will just be happy with it. I know its because I haven't hardly eaten in two weeks but still lol. I'm still waiting to see what time my surgery is tomorrow. They should call me around 4-6 tonight with my time to be at the hospital. I made my husband a cake last night and I didn't lick any batter or taste anything icing lol. I did it because he has been so supportive about me getting this surgery. I haven't cooked anything for him in two weeks lol he has been living on oatmeal. BUT, if I would have cooked I would have ate. And I didn't want to put myself through that torture. Now that I'm almost at the light at the end of the tunnel, it wasn't that bad making the cake for him. Well, I will update tomorrow night after I get out of surgery. I have to stay the night in the hospital. Wish me luck!