The chances of getting HIV from protected intercourse are quite low, especially when there is no evidence that the condom broke or fell off.
Some people get a flu like illness within a few weeks of getting HIV. This is called a seroconversion illness. At the same time, your symptoms are typical of many viral and bacterial infections. As you mention it is flu season, so it is very possible that another infection is causing your symptoms.
Although your chances of getting HIV seem low, the only way to know for sure is to get tested. Some HIV tests (NAAT) are about 90% accurate at a few weeks after contact. HIV antibody tests are about 95% accurate at 4 – 6 weeks. You might want to talk to your healthcare provider about the best way to test for HIV, given your situation.
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