What is the reason for a positive pregnancy test result after taking medication post-coitus?

Patient's question:

I had one-time sexual activity in October and took emergency contraception. On November 14, I had another one-time sexual activity, but the amount was not much. On December 23, I had one-time sexual activity again and took emergency contraception. On December 26, I have been experiencing symptoms for 12 days, using pregnancy tests, and it shows there is a possibility.

Doctor's answer:

Hello:
The accuracy of pregnancy test strips is still very high. If it shows pregnancy, it indicates a high possibility of pregnancy, but it is not absolute. There is a certain rate of false positives, so it is recommended that you test again or have your HCG levels checked at the hospital to confirm if you are pregnant. Based on your medication history, it is unlikely that you are pregnant, but emergency contraception is not 100% reliable and depends on whether you took it correctly. Therefore, a conclusion cannot be drawn at this time, and further tests are needed. It is still possible that you are pregnant.

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