The OraQuick test is imperfect. It is nearly 100 percent accurate when it indicates that someone is not infected and, in fact, is not. But it is only about 93 percent accurate when it says that someone is not infected and the person actually does have the virus, though the body is not yet producing the antibodies that the test detects.
You’ve got to hand it to the makers of this test: it can’t have been easy to devise a test that remains 93% accurate even in situations where it gives the wrong result. On the other hand, it’s only “nearly 100% accurate” in situations where it gives the right result, so there’s room for improvement.