Humans have been making beer and wine since before we knew how to make glass or steel.
Let me pose this question: Did your wine thief get cleaned or at a minimum rinsed after the last time it was used or did you set it down and let what ever the last thing it touched dry and rot all over it?
If "yes" I cleaned it) Then the odds of you infecting your wort are minimal. Bacteria require SOMETHING to feed/live on.
If "No" I was a lazy slob) You MIGHT be in trouble. There is still no guarantee that it is infected at this point. Let it ferment and taste it.
“I'm not drunk, I'm from Wisconsin.”
We have been out drinking your state since 1848!