Even before she was tested, the chance your partner had HIV was well under one in a thousand -- based on average HIV frequency in sexually active women in the US and most other industrialized countries. The oral fluid HIV test (Oraquick) misses very few infections; with her negative result 4 months after her last possible exposure, you can be completely certain she didn't have HIV. And your HIV antigen-antibody (AgAb, i.e. "4th generation") test is 100% assurance you do not have HIV.

Finally, in response to "I know I put myself at risk for other STDs":  maybe not. The frequency of transmissible STDs in women over 30 is low, even among women who continue to date fairly frequently. In absence of any symptoms, I would not recommend STD testing after such a sexual exposure. If you do pursue testing, please do not be tempted by many labs' "comprehensive" STD testing panels. Most of the tests are either unnecessary because of essentially zero risk, and others are simply not reliable enough to trust the results (especially testing for herpes -- don't do it!). If you decide to seek testing, in absence of symptoms or proved exposure to a particular STD, the only tests recommended by most STD experts are urine tests for gonorrhea and chlamydia (valid 3-4 days after exposure) and blood tests for HIV and syphilis (done at 6-8 weeks).

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD