It probably is the salt, but it's important to remember that fluctuations can have a lot of different causes, and trying to link today's number on the scale to yesterday's eating can lead you to a lot of false conclusions (salt is one of the few exceptions for many people).
It can take days and even weeks for the results of behavior (on-plan or off-plan) to show up on the scale. So if you expect today's weight to be entirely due to yesterday's eating, you occasionally may be dead-on accurate, but you can also end up jumping to some bizarre conclusions.
I was raised in a family that didn't use a lot of salt. I still don't have much of a salt-tooth. However, when I do crave salt, it's usually right before my period. I have learned that even if I avoid the salt, I will still gain some weight with TOM, but not nearly as much as if I indulge the salt craving. If I'm eating the extra salt, there's no way to see how much of the water weight is due to the salt and how much is due to the period.
Either way, it doesn't matter that much, because as long as I'm not overeating (which can be hard during TOM as well, because I'm far hungrier than usual) the water weight will disappear within a week - a little sooner if I drink more water, and eat a little lower-carb than usual.
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