Could you be pregnant with a negative pregnancy test one day before missed period?

Yes, it is possible to be pregnant with a negative pregnancy test taken one day before your expected missed period. Pregnancy tests work by detecting the presence of human chorionic gonadotropin (hCG) in your urine. hCG is a hormone produced by the placenta after implantation of a fertilized egg. However, it takes time for hCG levels to rise to a detectable level in your urine, and this can vary from woman to woman. For some women, hCG levels may not be high enough to be detected by a pregnancy test until several days or even a week after their expected missed period.

If you suspect you may be pregnant but have received a negative pregnancy test result, it is recommended that you wait a few days and test again. You can also consult your healthcare provider for a blood test, which can detect pregnancy earlier than a urine test.