Welcome to the forum. Thanks for your question.
Sometimes the title of a question contains all the information necessary for an accurate reply. Any and all available HIV tests are completely reliable by 8 weeks after the last possible exposure. So if indeed you were tested at 8 weeks or more after an exposure, you can be sure you weren't infected.
Now I have read the rest. Heterosexual transmission of HIV is extremely rare after any single episode of vaginal sex, and you were tested more than most experts would have advised. But most important, your test results indeed are completely reliable. You don't need further testing, despite common advice that 3 month testing is required for definitive results.
In case you're interested why standard advice is more conservative than necessary, take a look at the thread linked below. You'll see that it also contains links to a couple other discussions:
http://www.medhelp.org/posts/HIV-Prevention/what-is-the-window-period-for-hiv/show/1704700
So you in fact were at very low risk of HIV and you can be sure you weren't infected. You don't need any more testing, unless you find that because of the common 3 month advice you would be further reassured by having yet another test at that time. In the meantime, stay mellow -- and if you have not done so, you can safely resume sex with any regular partner you may have.
Best wishes-- HHH, MD