Hi there,
It's a legitimate company and no, there's no rational reason to believe that the test samples would or could be contaminated. Since your event was completely without risk, your test would be negative anyway.
from 2013-2015 i had a lot of encounters with other males and they were kissing cuddling frot sucking nipple i received oral two times but never involved me giving oral or any anal sex
What was your exposure, why do you think you might have contracted HIV?