If you took a HPT at 8dpo and got negative result is that definite tell are not pregnant or did just test too soon?

It is possible that the negative result on the HPT at 8dpo could be a false negative, as the levels of hCG (human chorionic gonadotropin) may still be too low to be detected by the test. To confirm the result, it is recommended to repeat the test after a few days, preferably with a more sensitive test strip or wait for a missed menstrual period.