Early pregnancy test strips can usually be detected as early as ten days after unprotected intercourse, but there are individual differences. Early pregnancy tests are measured by detecting the level of human chorionic gonadotropin (HCG) in the urine. When the HCG in the urine is higher than the normal value, the test will show a positive reaction, suggesting that you may be pregnant. Generally speaking, the egg is fertilized within 24-48 hours after it is discharged, and the fertilized egg is fertilized in about 6 days, so as early as 10 days after intercourse, the early pregnancy test paper can detect whether you are pregnant or not. When women use early pregnancy test paper to detect, they should pay attention to the use of morning urine for testing, because morning urine contains a higher concentration of human chorionic gonadotropin, and the accuracy of the test is also high. The test paper should not be soaked in urine for too long during operation. Of course, there are problems with false positives or false negatives when using this early pregnancy test paper test. Therefore, early pregnancy test paper alone can not clearly diagnose pregnancy, it is best to go to a regular hospital for blood human chorionic gonadotropin test and ultrasound examination, which will help to clarify whether pregnancy. Women need to consult a doctor at a regular hospital to determine if they are pregnant and under the doctor’s guidance.