What's wrong if the pregnancy test is negative after taking birth control pills and the period hasn't arrived yet?

Patient's question:

Okay, here is the translation following your instructions:
Took the birth control pill 12 days ago. Using a pregnancy test stick, only one red bar showed up. Will I still get pregnant? Digestive symptoms: Usually menstruation comes around these days at the end of the month, but it's still not here on the 29th.

Doctor's answer:

Emergency contraception can have some effects on menstruation, potentially causing it to come earlier or later. Generally, if a woman takes emergency contraception within 72 hours after intercourse, it can prevent an unintended pregnancy. If a pregnancy test shows two lines twelve days after taking emergency contraception, it is likely that she is not pregnant. It is recommended not to worry too much, as emergency contraception may interfere with menstruation. If she is not pregnant, it is advisable to use contraceptive measures such as condoms during sexual activity.

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