Biologically, four conditions need to be present for transmission to occur:
The virus must be present in an infectious body fluid from the HIV positive person.
The virus must be present at sufficient levels to cause infection.
There must be an effective route of transmission.
The virus must reach susceptible cells in the other person.
Your likelihood of infection is very low, but it is impossible to speculate on chances. I can only say, with such a brief exposure, odds are in your favor.
His answers about his status are irrelevant. Never take someone at their word about their status, they may not know their current status. Always protect yourself, that responsibility is yours alone.
Only your test results will tell you anything meaningful. His information about testing is also wrong, period.
CDC and NIH testing guidelines recommend a preliminary test at 6 weeks past last exposure, followed by a confirmatory test of any result at 13 weeks past exposure. This eliminates the chance of being in the "window period" at first test. 6 week results rarely change, but confirm nevertheless. There are also newer tests (much more expensive) that screen for viral RNA, they are sensitive, accurate, and conclusive as soon as two weeks past last exposure.
Also, no one gives you anything, you expose yourself by failing to protect yourself. Estimates are as high as 20% of HIV+ people do not their own status.
For future reference, you tested too soon. HIV will not be detected by any available test so soon after infection. Also, and perhaps most important... there is now medication approved called PEP, post exposure prophylaxis. It must be taken with 72 hours of exposure. It is highly effective at preventing HIV infection. It is taken for 30 days.
Again, your chances are extremely low. I assume you're a female, and the penetration was vaginal. That reduces the chances even further.
You have no reason to be terrified. Just test at the appropriate times, and take this as a lesson. Moving forward, you should test periodically, simply as part of being a sexually active adult you should know your status. And use protection.