Test result with one bar after 15 days of sexual intercourse indicates a negative result, suggesting that you are not pregnant for the moment. Another possibility is that the pregnancy is too early for the test strip to detect. It is recommended to wait for a week and test again for a more accurate result. As the test strip may have certain errors and cannot guarantee 100% accuracy, it is recommended to go to the hospital for a blood test of hCG after menstruation delay.
1. Interpretation of a Negative Result after 15 Days of Sexual Intercourse: The result of a blood test with a pregnancy test strip after 15 days of sexual intercourse shows one bar, indicating a negative reaction of the test, which proves that you are not pregnant for the moment. However, this testing method is usually not as accurate as blood sampling, so you may consider taking a retest.
2. When is the Best Time to Use a Test Strip after Sexual Intercourse? About 18 days after having regular sexual intercourse, you can detect pregnancy by testing urine, especially morning urine. After sexual intercourse, pregnancy can be detected within one week at the earliest and approximately three weeks at the latest. However, due to differences in the quality of test strips, there may be variations in the test results.
3. Recommendation for Confirming Early Pregnancy: Blood Test for hCG: After the fertilized egg implants in the uterus, a new hormone called human chorionic gonadotropin (hCG) is produced in the pregnant woman's body. This hormone helps maintain pregnancy and can be detected in the blood about 10 days after conception.
