Can I Trust a Negative Pregnancy Test 20 Days After Intercourse? - Obstetrics and Gynecology

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If you take a pregnancy test 20 days after sexual intercourse and it shows one line, you can generally feel reassured that you are not pregnant.
However, if your period is five days late and you are experiencing slight breast tenderness and fullness, it may be advisable to consult a healthcare professional for further evaluation.

Fangfang, 10~19 year old female. Ask Date: 2017/04/30

Dr. Huang Jianzhong reply Obstetrics and Gynecology


If you take a pregnancy test 20 days after sexual intercourse and see one line, you can be reassured that you are not pregnant.
If your period is five days late and you have slight breast tenderness and swelling, it is recommended to take another pregnancy test 27 days after intercourse.
If you still see one line, you can be confident that you are not pregnant.

Reply Date: 2017/04/30

More Info


When it comes to trusting a negative pregnancy test result 20 days after intercourse, there are several factors to consider. Generally, most home pregnancy tests are designed to detect the hormone human chorionic gonadotropin (hCG), which is produced shortly after a fertilized egg implants into the uterus. This typically occurs about 6 to 10 days after conception, but it can vary based on individual circumstances.

In your case, since you are testing 20 days after intercourse, the test should be quite reliable. If you received a negative result, it is likely that you are not pregnant, especially if your menstrual cycle is typically regular and you are now five days late. However, it is important to note that while home pregnancy tests are quite sensitive, they are not infallible. False negatives can occur, particularly if the test is taken too early or if the urine is diluted.

The symptoms you mentioned, such as breast tenderness and a feeling of fullness, can be associated with premenstrual syndrome (PMS) or other hormonal changes rather than pregnancy. Stress, changes in routine, illness, or even dietary changes can also affect your menstrual cycle and cause delays.
If you are still concerned about the possibility of pregnancy, it may be prudent to wait a few more days and take another test. Alternatively, you could consult with a healthcare provider for a blood test, which can detect pregnancy earlier and with greater accuracy than home tests.

In summary, while a negative pregnancy test 20 days after intercourse is generally trustworthy, individual circumstances can vary. If your period does not arrive soon, or if you continue to experience unusual symptoms, seeking medical advice would be a wise step.

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Hello, it's been over 12 days, so it's accurate. Wishing you good health.

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Dr. Cao Guotao reply Obstetrics and Gynecology
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