How many days does the emergency contraceptive pill take to have an effect?

Patient's question:

What should I do if I get pregnant unexpectedly? The harm is relatively small. How many days does emergency contraception take to take effect?

Doctor's answer:

Generally, there is a possibility of pregnancy during ovulation, which refers to 14 days before your next menstrual period. Your last menstrual period was on the 24th, and your menstrual cycle is approximately 25-29 days long. Therefore, your next menstrual period is expected to be around May 19th to May 23rd, making your ovulation period approximately May 5th to May 9th. So, there is a possibility of pregnancy if you had intercourse on the 10th. You have taken emergency contraception, which should be effective. No further treatment is needed at this time. Taking emergency contraception may affect your menstrual cycle. If your period does not arrive when it should, it is recommended to take a pregnancy test.

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