Will the 72-hour emergency contraceptive pill fail?

Patient's question:

Once I vaguely remembered that counting the days was unsafe. Once I didn't take any measures. I ate around 10 PM on the third day, but about half a month later, I didn't get a day off. I tested two red strips on the exam paper and then fainted directly. Why did you still get pregnant after eating Yuting?

Doctor's answer:

In fact, the success rate of breastfeeding for these drugs is not 100%, but about 80%. Therefore, women who take these drugs still have a 20% chance of getting pregnant. If the drug cannot suppress ovulation to prevent the fusion of sperm and egg, or prevent the fertilized egg from implanting in the uterus, then according to the aforementioned "all or none" theory of early pregnancy, in this case, the baby can be preserved without miscarriage.

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