Daily weight fluctuation is completely normal. As long as the overall trend is downward, you’re good.
2 days is not enough time to establish a trend. Weigh daily for a month then come back and look at it.
My advice is, stop being afraid because it increases cortisol which increases ghrelin which makes you eat stuff in order to lower cortisol. WEIGHT FLUCTUATIONS ARE NORMAL. Do research and don’t stress too much about it. Have a solid habit and stick to it. Stop fearing the scale. And if you do, don’t weigh yourself.
Hormones can definitely make you retain water. (They can also make me constipated, but at least that doesn’t happen on a fast!) Not sure if it’s the luteal phase for me, but I definitely know when to expect the scale to be higher each month!
On day 17 of a 31 day fast I gained 3 lbs out of nowhere. I hadn’t had a single calorie in 17 days and hadn’t made any changes to my routine. 2 days later it disappeared along with the weight I would expect to lose in that time. Fasting is weird and our bodies be crazy sometimes.
It’s all about the long term trend.