As long as your *completely* over the "acute" WD stage, no, one use isn't enough to reestablish a physical dependence. But 12 days would be cutting it close for some people.
Although the acute phase of morphine WD is generally done by that point(and many sources(both medical and anecdotal) indicate diamorphine WD is even shorter) but for me personally, after more than a week, I am still sick as hell(though that has a lot to do with severe insomnia, and not eating when I am already extremely thin) but, from experience, half a gram has made my WD FAR WORSE after several days off. Mind you, this was extremely good dope.
But be careful, it doesn't take much.