Don't worry.
On inspection last night I found that I forgot to put water/vodka in the airlock.
So the bacteria found its way in there pretty easy.
I racked from the bottom, tasted it also. It may end up as vinegar, not sure if there was a hint of vinegar taste... or if it was just sour and...
I'm 2-3 weeks into my first cider batch, when I discovered this last night.
My beer has never turned out like this, however I've never brewed cider before so I wasn't sure if this was normal or not. I'm guessing not.
I'll have a taste when I get home tonight to see if it's vinegar. And...