My period is late but i failed the pregnancy test. basically, i have early pregnancy symptoms but no baby.

Tests are accurate: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If worried, one can retest after another 5-7 days.