Scale fluctuates by a few pounds within the same minute?

I've been really focusing on getting fitter and trying to lose a few pounds lately, so have been weighing myself. I stepped on the scale last night, stepped off, then stepped back on again, and the weight changed by 3 lbs! I moved it to another area in case that one wasn't level enough, and it did the same thing, just by 2 lbs! I know weight can fluctuate, but I have a hard time believing it can fluctuate by a few pounds in under a minute. 🤣 Any idea why it could be doing this?