Emergency contraception: when and how to take it (Banpo OB/GYN)

An unexpected contraceptive mishap can happen to anyone, and the confusion in that moment is completely understandable. To put it simply, the sooner emergency contraception is taken, the more effective it is. Therefore, consulting with an OB/GYN specialist and taking it as early as possible after intercourse is the safest approach.

In cases where a condom broke or intercourse occurred without contraception, many people eventually seek emergency contraception after much deliberation. As this is a question frequently asked multiple times a day in the clinic, we will summarize the precise concept, effectiveness, common misconceptions, and side effects of emergency contraception all at once.

What is emergency contraception?

Emergency contraception is commonly referred to as the "morning-after pill" and is a medication that prevents pregnancy by delaying ovulation or interfering with the fertilization and implantation process. It is not a medication that terminates an already established pregnancy, and it is entirely different from abortion pills. We highlight this first because many people confuse these points.

It's good to remember that it is not a regular method of contraception, but an auxiliary measure used once for help in unexpected situations.

How are types of emergency contraception categorized?

They can be broadly divided into two categories. Since the available administration times and characteristics differ, it is necessary to choose the one that suits your situation.

Both categories are prescription medications, so we recommend discussing with a specialist, considering both the timing of administration and your personal health condition.

How effective is emergency contraception?

The key is the timing of administration. It is reported that the sooner it is taken after intercourse, the higher its effectiveness. However, you must understand that it is never 100% effective in preventing pregnancy.

Especially if ovulation has already occurred, the effectiveness of the medication may decrease. Therefore, even if the same medication is taken at the same time, there can be individual differences in the outcome.

Emergency contraception is a means to lower the possibility of pregnancy, not a drug that guarantees absolute prevention. Even after taking it, follow-up observation is necessary.

What are the common side effects?

Most symptoms are mild and temporary. While the degree varies from person to person, the following changes may generally occur:

• Nausea or a feeling of queasiness
• Breast tenderness or discomfort
• Changes in menstrual cycle, becoming earlier or later
• Fatigue and headache

These symptoms often improve naturally within one to two days. However, if symptoms persist or are severe enough to interfere with daily life, it is safer to seek medical attention. If you have previously needed consultation for menstrual pain or irregularities, you might also consider checking your cycle changes at this opportunity.

If my period doesn't come after taking the pill, am I pregnant?

Not necessarily. Emergency contraception often causes menstrual cycles to come earlier or later, so a period that differs from usual does not immediately mean pregnancy. However, it is advisable to get tested in the following situations:

• When your period is delayed by more than 1 week past the expected date
• When there is no period 3 weeks after intercourse
• When accompanied by symptoms suggestive of pregnancy

If you feel anxious, you can confirm with a simple urine or blood test through a general consultation. It's much more reassuring to confirm than to worry vaguely.

If you have questions, rather than searching alone, please feel free to ask quickly when concerned about a contraceptive mishap and explain your situation.

Frequently Asked Questions about Emergency Contraception

We have compiled frequently asked questions from the clinic.

Many people ask if it's okay to take it frequently. As it is a high-dose hormone medication, repeated use is not recommended. If regular contraception is needed, it is much more stable to find a suitable method through contraception counseling.

It is also frequently asked whether the effect of the medication is maintained if intercourse occurs again after taking it. The effect of a single dose does not extend to subsequent new acts of intercourse, so if there is additional intercourse, the possibility of pregnancy can arise again.

Regarding whether to take the pill even if intercourse occurred during menstruation, if it was late in the menstrual cycle or if the cycle is irregular, there might still be a possibility of pregnancy, so consultation is needed depending on the situation.

How to prepare for more stable contraception?

While emergency contraception is a helpful medication in unavoidable situations, repeated use can increase the burden of irregular periods, side effects, and contraceptive failure. Therefore, it is important to have a regular contraception method that suits you.

Contraception methods offer various options depending on your lifestyle and health condition. If daily management is burdensome, you might consider intrauterine device (IUD) contraception or Implanon, which are maintained for a certain period with a single procedure. If you are planning pregnancy, you might opt for pre-pregnancy care.

If you're unsure which method is right for you, reviewing your menstrual cycle and health condition together can help in the decision-making process.

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Dr. Eun-Jin Lee, Chief Director (Specialized in Obstetrics and Gynecology at Samsung Medical Center, Member of the Korean Society of Obstetrics and Gynecology, Member of the Korean Society of Menopause) Dr. Eun-Jin Lee's Profile First Published 2025-11-22 / Last Reviewed 2026-06-17

This article is for general informational purposes and individual differences may exist. Please confirm accurate diagnosis and prescription through consultation with an OB/GYN specialist.