[DAVID GAGNARD]

Unless you have a serious leak in the line/caliper (which you would have seen fluid leaking from by now) the source of your bubbles are the threads on the bleeder itself................I've seen this a hundred times...
It will not hurt anything,once you get fresh fluid coming out, then have someone in the car manually pumping the brake pedal and do the last bleed the old fashion way with 2 people and be done with it..........

If you really want to get rid of the bubbles, the only thing I've seen work is to remove the bleeder it self from the caliper (you can use vice grips to pinch off the soft line while you do this) and wrap the threads with Teflon tape and re-install, no more air bubbles................