The blood test;x-ray;skin test ;if positive along with your active symptoms then only you are positive.Most of the time the skin test called the Mantoux test
is positive.It alone cannot be a criteria for diagnosis of TB .
-Since you have been treated with proper medicines for proper duration
-you don't have any symptoms.
-your X-ray is normal
Please don't get worried.You are right now nothing to fear about TB.