Putting it all together, the chance you caught HIV probably is less than 1 in a million, or 37 times lower than your lifetime risk of dying by lightning strike.
1) If you used a condom, the risk of HIV was zero. Without condoms, the average risk of infection if your partner was infected is around 1 in 2,000. The odds are she wasn't infected. You are the one to judge whether a condom was used, not me.
2) I never guarantee someone isn't infected, but the odds are greatly in your favor. You will have to make your own decision about sex with your wife.
3) Four weeks (29 days) is pretty reliable and from a purely risk assessment perspective you don't need further testing. But a negative antibody test at 6 weeks would be still more reliable.
For further detail use search the function, using search terms such as 'HIV transmission risk', 'time to positive HIV test', and 'HIV anxiety'.
Thanks again for your comments. One last question. The manufacturer states a Proviral DNA PCR is 99.9% reliable at 28 days. Do you agree with this statement?
Information provided by test manufacturers is highly regulated, at least in the US and most western European countries and presumably is reliable, but I do not have independent information about it.
Where did you get that figure from? Do you have a link?