Welcome to the forum and thanks for your question.
I understand your concern, having had sex with someone known to have HIV -- and also understand your possible confusion, since there is a lot of misinformation out there about the time it takes for definitive HIV testing. However, the bottom line is that your negative test results are 100%, definitive proof you were not infected with HIV. No further testing is necessary.
Most of the misinformation about reliable testing is either based on older tests or, most commonly, applies ONLY when the only tests done are the HIV antibody tests. When antibody testing is combined with direct tests for the virus itself -- HIV p24 antigen or RNA/DNA testing by PCR -- negative results are virtually 100% reliable after 4 weeks. I have explained this in some detail previously so won't repeat it here; instead, read the thread in the link below.
In any case, once it became apparent your partner didn't have HIV after all, you really should have stopped all worry at that point. But even if she really were infected, your tests are definitive proof you didn't catch it. You don't need another test at 6 months or at any other time. But if you decide to do it anyway, you needn't worry about false positve results because of routine immunizations. That doesn't happen.
So all is well. Do your best to relax and stop worrying about all this.
Best regards-- HHH, MD