What the heck happened today

I don't have a whole lot to say but I don't understand what happened this morning just like when I was trying to get to the 50 lbs lost milestone I am hanging around the weight I am at now. I know that I gained weight this weekend because of everything I at but was able to lose most of it by now. What I don't get is that yesterday I was running all over Nashville, was so busy that I didn't get to have lunch, I worked out in the morning, and walked for a mile at night with the family so imaging my surprise when I got on the scale this morning and gained .2 lbs. I know that is almost nothing but I was surprised to see a gain in the first place. I hope tomorrow goes better.