Was it a new vial? Had you just popped seal off? Brand new sterile needle? Re-used drawing needle? Has the vial been sitting out with rubber exposed for long period of time?.....
Proper answer would be that it's contaminated.. My answer, it depends on circumstances new needle, new vial, "newer" vial that hadn't been out long if run with it. Now I know that's not the "right" thing to do but that's my opinion not the gospel.