Last Saturday I weighed 173.5 around noon. On Monday later I was feeling slimmer and couldn't resist seeing how much I weighed around the same time, and it was 177! I figured it was water retention, but today I am at 175.4 and I am really wondering if I gained that much weight back. I haven't been overeating at all, the only difference is I took 2 days off from the gym.
It could be water weight! Your body fluctuates between 2-5 pounds everyday, no need to worry. My weight fluctuates between 2-3 pounds a day, depending on the foods I've eaten, activity level, etc.