Welcome to the forum. Thanks for your question.
First, I'll say that in the US and other industrialized countries, HIV is believed to be rare (under 1 chance in 1,000) in most escorts, i.e. upscale/expensive female sex workers by appointment. And even if yours had HIV, the average transmission risk per unprotected vaginal sex exposure is under 1 in 1,000. So even without testing, the odds you caught HIV was in the range of 1 in a million. And even if your doctor were correct that your negative test result was "only" 90% reliable, that result drops your risk down to 1 chance in 10 million. So even if I agreed with your doctor's statistics (see below), I would advise you not to be worried and that no further testing is necessary.
1) As implied above, your doctor's views on HIV testing are atypical and almost certainly wrong. Perhaps he is referring to the older HIV antibody tests no longer used. The stand-alone antibody tests in current use are virtually 100% reliable after 6-8 weeks, and the combination of negative antibody plus p24 antigen 100% reliable any time after 4 weeks. (See
http://www.medhelp.org/posts/show/1704700)
2) If you didn't produce antibodies but had HIV, the p24 component of the test would be positive. It's the antibody that clears p24 from the blood; without antibody, p24 ould persist. That's why the test is 100% reliable: after 4 weeks, either antibody or p24 is always present in HIV infected people.
3) I recommend against PCR testing. It's expensive and unecessary.
4) You've already had 100% reliable test results.
5) Such delayed positive results are for antibody only, and have probably not occurred for 15+ years, since routine use of modern tests.
Bottom line: You were at very low risk for HIV to start and your test results prove conclusively you were not infected. You need not be at all worried and do not need further testing.
Best regards-- HHH, MD