It is highly unlikely for HIV symptoms to appear as early as 3 days after exposure. The acute HIV infection stage, which occurs shortly after contracting the virus, may exhibit flu-like symptoms, such as fever, fatigue, sore throat, swollen glands, or rash. However, these symptoms typically appear 2-4 weeks after exposure and can last for a few days to several weeks. It is important to remember that not everyone experiences symptoms during the acute stage, and HIV can remain asymptomatic for an extended period. Testing is the most reliable way to determine HIV status.