After intercourse 7 days 14 days 21 days have used the early pregnancy test paper to test several times are a bar, if the test paper no quality problems, the possibility of pregnancy is very low. In general, if a woman is successfully pregnant, the HCG level in the urine increases after the menstrual period is delayed, and at this time the test is conducted with the early pregnancy test paper, and the result is positive, showing two bars. If you have tested with early pregnancy test paper 7 days, 14 days, 21 days after intercourse, and have tested several times with one bar, then you can basically rule out that you are pregnant. If you want to further clarify the test, you can go to the hospital for a blood test to see if the human chorionic gonadotropin in the blood is elevated, and the result will be more accurate.