What's the reason for taking a 2-bar test but still getting your period?

Question
Hello doctor,
I took a pregnancy test with 2 lines, 1 dark, 1 light, but 2 days later I got my period again. So the doctor asked me to try 2 lines but still get my period, why? Thank you doctor.
Anonymous customer
Answer
Answered by Specialist I Tran Thi Thu Ha - Obstetrician and Gynecologist - Obstetrics Department, Vinmec Times City International General Hospital.
Hello,
With the question “What is the reason for taking a 2 bar test but still getting your period? , the doctor would like to answer as follows:
According to statistics, pregnancy test strips work correctly in 90% of use cases. Many women wonder about the fact that the test strip shows 2 different dark lines, in which, the second line appears very faint. That's because hCG levels are low and you took a pregnancy test while the embryo was forming. According to experts in Obstetrics and Gynecology, if you see a pregnancy test strip with 1 bold line and 1 faint line, you should not rush to conclude that you are pregnant. There are four main reasons for this situation, namely:
Taking the pregnancy test too early or at the wrong time of day. Today, the level of β - HCG present in blood and urine is not enough to pass or equal the threshold of positioning of the test strip, so the pregnancy test strip has a bold and blurred line. Using the test strip not according to the instructions, due to being too quick to read the effect, the strip was taken out earlier than the specified number of minutes, leading to the effect not showing clearly yet. Using poor quality test strips gives negative results. Not getting pregnant, or having an early miscarriage because then menstruating again, it could be early miscarriage blood that makes you think it's menstrual blood. Therefore, you need to monitor and have unusual symptoms: Abdominal pain, abnormal bleeding, prolonged, you should see an Obstetrician and Gynecologist for specific advice.
If you still have questions about the 2-bar test but still have your period, you can go to the hospital of Vinmec Health System for further examination and advice. Thank you for trusting and sending questions to Vinmec. Wishing you lots of health.
Best regards!