Scales being silly!

So this may not be news to anyone here, but after I weighed myself this morning, I moved the scales a little because they didn't quite look evenly parallel to the wall (yes, I'm silly about things like that), and then I got back on, my weight had gone up by 2 pounds! So I experimented, trying it in different places on the bathroom floor, and it varied through about 4 pounds..how do I know which measurement to use? My husband says this first one because it's the right comparison, that's where I'd been measuring from before, and that makes sense, but is it accurate? Which measurement from my scales is my actual weight? Argh!

Thanks for any advice.