Two weeks after becoming infected with HIV, it is likely that you will be able to test for it. If antibodies are checked, some people may be able to detect it. But most at two weeks, the amount of antibodies in circulation is not yet particularly high and may not be detected. Therefore, it is possible to take a test that shortens the window period, such as a combined p24 antigen test, which is usually a fourth-generation test for HIV antibodies, and the p24 antigen can be tested at the same time as the HIV type 1 and 2 antibodies. This test can be detected in two weeks, but a negative test does not rule out HIV infection with any certainty because the corresponding window period may be extended to six weeks. If the test is repeated at the sixth week, it will be possible to determine if the person is infected with HIV. If the result is negative, it can be completely ruled out, but if it is positive, it is actually not 100% certain, and further confirmation tests are needed.