I still remember the time where I bought three Popeyes chicken sandwiches because I was so hungry and I ate all of them and gain like 1 or 2 pounds. And then I wake up the next day, I lose like 3 pounds or so LOL.
Best to always weigh yourself in the morning first thing. I do find it discourages people who are trying to lose weight to weigh everyday since our bodies fluctuates vastly day by day, especially for women.
Eat more vegetables and stay healthy.