Are hpt accurate 4 weeks after sex if u dont get a period? plz dont say "a urine test if done correctly is reliable 3 weeks.."

Of course: Home pregnancy tests are reliable 3 weeks after sex, which means they are accurate 3 weeks after sex, 4 weeks after sex, 5 weeks after sex, etc... The 3-week mark is chosen to prevent the need to repeat a false-negative result if the test is done earlier, and also to allow time for one's period to come and thus avoid needing a test. (In reality, tests can be positive 2 weeks after sex.)