Rubbing you eyes 6 days after treatment is unlikely to change the filler. For the first 24-48 hours, I believe it is possible to affect the fillers and recommend not to rub or massage the area.
The fillers themselves do not build up, but your body makes collagen as a response to the injections. There is an inflammatory response to injections and this creates the collagen. It usually is not the same volume as what the filler creates immediately but some patients show clinical...
In my practice, I have every filler patient follow up with me personally 2-3 weeks after injection for evaluation and "after" photos (so the patient and I can compare them to their "before" photos). By 2 weeks, the filler should have "settled in" and the final result should be apparent....