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In general, antibody tests that use blood can detect HIV slightly sooner after infection than tests done with oral fluid. It can take 3 to 12 weeks (21-84 days) for an HIV-positive personâs body to make enough antibodies for an antibody test to detect HIV infection. This is called the window period.
Most people who are newly infected with HIV will receive a preliminary positive test result from these tests within 3-6 weeks, but some may take as long as 3 months before their bodies produce sufficient antibodies to show up. Get tested ASAP, and then if it's negative, re-test again in 3 months.