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There are two tests antigen and antibody. Antigen enters the body with the virus, an antibody is formed in the body to fight the antigen. Hence antigen test becomes positive earlier than the antibody test. When the antibody starts to rise, it neutralize the antigen which gradually comes down. The advantage of fourth-generation test is that it detects both antigen and antibody. If one is low other is high. In either case, if you are infected, the test would be positive.
Even if the female is positive, you may not get infected. Male to female transmission is more because man deposits 2-5 ml of semen in the vagina. We do both antigen and antibody test. At three months, if someone is negative we repeat the antibody test only at six months but never seen anyone turning positive after being tested negative at three months.