Could be water weight, could be hormones, could be the day of the week, could just be...your turn to have a minor setback. You'll have some fluctuation here and there and as you lose more and the weight loss slows, you may notice it more. This is not a "failure" and it's destructive to frame it that way to yourself. It's part of the process. It's going to be ok. Don't beat yourself up. Don't sabotage yourself. Just keep going.