Will pregnancy test accurate 6days delayed and sex happened on july 17-19?

May be too early: There are significant differences in sensitivity among HPT kits. The intervals between the first day of the LMP, ovulation, fertilization, implantation, and production of sufficient hCG for detection by a HPT are variable. If pregnancy is suspected despite a negative test, the test should be repeated in one week. Confirmatory testing in a physicians office should be performed by urine/serum or U/s

YES: Pregnancy test turn positive very early in a pregnancy. By 6 days they are accurate

Maybe: The pregnancy tests are very accurate but still are commonly incorrect. Recheck in 1 -2 weeks to be sure.