TB or no TB, that is the question

yesterday our office was infiltrated by a swarm of public health nurses stabbing us all with their weapon of choice. the needle.
they plunged it into my arm forcing a bubble of some sort of solution just under the surface of my skin.
will it react?
someone at our office developed TB, so we all needed to be tested since we were all exposed to it.
today my arm seems to be ok, so i think that i am TB free.