Confusion Over Pregnancy Test Results and Menstrual Bleeding - Obstetrics and Gynecology

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A pregnancy test shows a positive result, but menstruation occurs?


Hello doctor, my menstrual cycle is about 30 days.
This month, I was supposed to start on February 1, but it was delayed by four days.
This morning (February 5), I bought a pregnancy test at the pharmacy, and there was one dark line and one faint line, so I thought I was pregnant.
However, in the afternoon, I started bleeding.
I immediately went to the obstetrics and gynecology department and the doctor used a pregnancy test strip, which did not show any signs of pregnancy.
He believed I was just having my period and explained that the pregnancy test can detect pregnancy at very low levels, while the test strip requires a higher level to confirm pregnancy, so he said his method was more accurate.
He dismissed me, but I still feel very anxious and fear that the bleeding might be caused by pregnancy (I have experience with one previous delivery).
Could this situation occur? How can I confirm if I am pregnant? (Currently, the bleeding is indeed similar to a normal period.) I just don't understand why the pregnancy test could indicate pregnancy.

R, 20~29 year old female. Ask Date: 2016/02/05

Dr. Lü Lizheng reply Obstetrics and Gynecology


Currently, it is still uncertain.
It is recommended to test again in a few days for more accurate results.
Sincerely, Dr.
Lu Li-Cheng, Taoyuan Hospital.

Reply Date: 2016/02/05

More Info


Confusion over pregnancy test results and menstrual bleeding is a common concern for many women, especially when experiencing unusual symptoms. Based on your description, it seems you are navigating a complex situation involving potential pregnancy and menstrual irregularities. Let’s break down the key points and provide some clarity.

Firstly, the discrepancy between the home pregnancy test (HPT) results and the clinical test performed by your doctor can be attributed to several factors. Home pregnancy tests work by detecting the hormone human chorionic gonadotropin (hCG) in your urine. These tests can vary in sensitivity; some can detect lower levels of hCG than others. The presence of a faint line on your HPT suggests that there might be some hCG in your system, indicating a possible pregnancy. However, if the level of hCG is very low, it may not be enough for a more sensitive clinical test to register a positive result.

The bleeding you are experiencing can be concerning, especially if you suspect you might be pregnant. In early pregnancy, some women experience what is known as implantation bleeding, which can occur when the fertilized egg attaches to the uterine lining. This type of bleeding is usually light and short-lived. However, if the bleeding resembles a normal menstrual period, it could indicate a different issue, such as a miscarriage or an abnormal pregnancy.

Given your previous experience with childbirth, it’s understandable that you would be anxious about the possibility of complications. If the bleeding is heavy and accompanied by severe cramping or pain, it is crucial to seek immediate medical attention. Your healthcare provider may recommend a blood test to measure your hCG levels, which can provide more definitive information about your pregnancy status. A rising hCG level typically indicates a viable pregnancy, while a declining level may suggest a miscarriage.

In terms of confirming whether you are pregnant, the most reliable method is a quantitative blood test for hCG, which can detect lower levels of the hormone than a urine test. If you are still experiencing confusion or anxiety about your situation, consider scheduling a follow-up appointment with your healthcare provider. They can perform an ultrasound to check for the presence of a gestational sac or embryo, which can provide further clarity.

It’s also essential to monitor your symptoms closely. If you notice any significant changes, such as increased bleeding, severe pain, or other concerning symptoms, do not hesitate to seek medical care. Early intervention can be critical in managing any potential complications.

In summary, while home pregnancy tests can provide initial insights, they are not infallible. Clinical tests and follow-up evaluations are necessary for a comprehensive understanding of your reproductive health. Your concerns are valid, and it’s important to advocate for your health by seeking the appropriate medical guidance.

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