Based on the information you have provided, it seems that you have tested negative for
HIV-1 and HIV-2 using the fourth-generation HIV test at 64 days after potential exposure, as well as using third-generation HIV tests at 48 and 67 days after potential exposure. Additionally, an antibody test performed at 72 days after potential exposure also returned a negative result.
It is important to note that HIV tests are highly accurate, but there is a window period during which the virus may not be detected. The window period for fourth-generation HIV tests is typically around 2-4 weeks, while the window period for third-generation HIV tests is around 4-6 weeks. Therefore, testing negative for HIV using these tests at the time points you mentioned is a good indication that you do not have the virus.
However, it is always a good idea to discuss your specific situation with a healthcare provider who can offer more personalized guidance and advice. They may recommend additional testing or precautions based on your individual risk factors and circumstances.