No, that sounds like nerves or anxiety. If it was from MS I don't think it would happen when you use the leg... I think that proves it's something to do with a nerve. I have had tingles like that too, and even numbness when moving my ankle. My aunt has MS and has a bunch of symptoms that don't sound like this!
Have you ever asked her how it started? If we knew how it presented it may out some of our minds at a little more ease.
From what my Neurologist told me, MS almost always presents itself first with your vision - double vision or going blind in one eye - that kind of thing.
Not always of course, but he said it's the most common first sign of it.
And the numbness isn't just a little numbness here or there - it's the kind of numbness where an entire limb goes numb and for days at a time - it's something you would notice as seriously off.
Most likely, it's anxiety.
FYI - your chances of getting MS are less than 1/2 of 1% - something to think about.