Emergency contraception can help prevent pregnancy after sex without birth control or when a method fails. If this is your first time using it, act as soon as possible: some pills work best within 3 days, while other options can be used within 5 days. A copper IUD is the most effective option. Emergency contraception does not end an existing pregnancy or protect against sexually transmitted infections.
Using emergency contraception for the first time can feel unfamiliar, especially when you are worried about a possible pregnancy. The important thing is to understand which options are available, how quickly you need to act, and what to expect afterward. Emergency contraception is a well-established way to reduce the chance of pregnancy after unprotected sex, and you can discuss your options with a healthcare professional or pharmacist.
When might you need emergency contraception?
Emergency contraception may be appropriate after vaginal sex when pregnancy is possible and you did not use contraception or think your usual method may have failed. You do not need to have used birth control previously to consider it.
Situations in which emergency contraception may be useful include:
- A condom broke, slipped off, or was not used correctly.
- You had sex without using contraception.
- You missed contraceptive pills or made another mistake with your usual birth control method.
- A diaphragm or another barrier method moved out of place.
- You experienced sexual assault and need help preventing pregnancy.
According to the World Health Organization (WHO), emergency contraception is intended to reduce the risk of pregnancy after unprotected intercourse or possible contraceptive failure. If you are unsure whether your situation calls for it, seek advice promptly rather than waiting to see whether your next period arrives.
Which emergency contraception options are available for first-time use?
There are two main approaches: emergency contraceptive pills and a copper intrauterine device (IUD). Both can help prevent pregnancy, but their timing, effectiveness, and practical requirements differ. The most suitable choice depends partly on how much time has passed, your medications, whether you use hormonal contraception, and which methods are available where you live.
Emergency contraceptive pills
Two commonly used types of emergency contraceptive pills contain levonorgestrel or ulipristal acetate. Both work mainly by delaying or preventing ovulation, which is the release of an egg. They do not terminate an established pregnancy.
Levonorgestrel: This pill is generally intended to be taken as soon as possible, commonly within 72 hours of unprotected sex. It may still provide some benefit when taken later, but effectiveness can decrease with time.
Ulipristal acetate: This pill can be taken within 120 hours, or five days, after unprotected sex. It is generally a more effective pill option than levonorgestrel when more than 72 hours have passed.
The UK National Health Service (NHS) explains that the time limit depends on the method: levonorgestrel is used within three days under its guidance, while ulipristal acetate can be used within five days. Availability, prescription requirements, and product instructions vary by country, so confirm the appropriate option with a pharmacist or healthcare professional.
The copper IUD
A copper IUD is a small, T-shaped device that a trained healthcare professional places inside the uterus. When inserted within five days after unprotected sex, it is the most effective form of emergency contraception. It can also remain in place as ongoing birth control if you choose to use it for that purpose.
This option requires a clinical appointment and an assessment of whether an IUD is appropriate for you. It may be worth discussing if you want the most effective emergency method, prefer not to use a pill, or would like longer-term contraception after the immediate concern has passed.
How soon should you take emergency contraception?
Act as soon as possible. You do not need to wait for symptoms, calculate your cycle, or wait until your period is late before seeking emergency contraception. Emergency methods are time-sensitive, and waiting can reduce your available choices.
If less than three days have passed, several options may be available. If three to five days have passed, ulipristal acetate or a copper IUD may still be suitable. A healthcare professional can help you compare the options based on the time elapsed and your circumstances.
If more than five days have passed, contact a healthcare professional for advice about pregnancy testing and any remaining options. Do not assume that emergency contraception will be effective outside the recommended time window.
What should you do before taking the pill for the first time?
You generally do not need a special examination before using an emergency contraceptive pill. However, a brief conversation with a pharmacist or healthcare professional can help you choose the right product and use it correctly.
Before taking it, be ready to explain approximately when the unprotected sex occurred, whether you have taken emergency contraception recently, and whether you use regular hormonal birth control. Mention any medicines or supplements you take, because some medicines can affect how well emergency contraceptive pills work.
Follow the instructions supplied with the specific product. Do not take extra tablets or combine different emergency contraceptive pills on your own in an attempt to improve protection. If you are unsure which medicine you have, confirm its active ingredient with a pharmacist before taking it.
What side effects might happen after your first dose?
Most people do not experience serious problems after taking emergency contraceptive pills. Temporary effects can occur, and experiencing them for the first time does not necessarily mean anything has gone wrong.
According to the American College of Obstetricians and Gynecologists (ACOG), possible short-term effects of emergency contraceptive pills include:
- Nausea or vomiting.
- Headache or dizziness.
- Abdominal discomfort or cramping.
- Breast tenderness or tiredness.
- Spotting or changes in the timing or flow of your next period.
These effects usually settle without specific treatment. Your next period may arrive earlier or later than expected and may be lighter or heavier than usual. The pill's side effects cannot reliably tell you whether it has prevented pregnancy.
What if you vomit after taking the pill?
If you vomit soon after taking emergency contraception, the medicine may not have been fully absorbed. The time that matters depends on the particular product. The NHS guidance on emergency pill side effects advises contacting a pharmacist because another dose may be needed when vomiting occurs within two hours. Check the instructions for your exact product and get advice promptly rather than automatically taking another tablet.
Will emergency contraception affect your future fertility?
Emergency contraceptive pills do not cause infertility. They work mainly by delaying or preventing ovulation, and they do not permanently stop your body from releasing eggs. Fertility can return quickly after use, so pregnancy is possible following later unprotected sex.
Repeated use can cause additional menstrual irregularities, and emergency contraception is generally less reliable as an ongoing strategy than regular contraceptive methods. Nevertheless, using an emergency contraceptive pill more than once is not, by itself, a reason to assume that your future fertility has been harmed.
What should you do after taking emergency contraception?
Taking emergency contraception is one step in reducing pregnancy risk. The next steps help you know whether it worked and protect against pregnancy from later sexual activity.
Know when to take a pregnancy test
Emergency contraception can fail, even when used correctly. Take a home pregnancy test about three weeks after the unprotected sex if you have not had a normal period or want to confirm the outcome. Test sooner if your period is more than a week late, and seek professional advice if the result is negative but your period still does not arrive.
MedlinePlus, a service of the US National Library of Medicine, notes that emergency contraception can change the timing and flow of the next menstrual period and recommends contacting a healthcare professional if a period has not arrived within three weeks after use.
Understand protection against future pregnancy
An emergency contraceptive pill does not provide ongoing protection for sex that occurs later in the same cycle. Use condoms or avoid vaginal sex until you have a regular contraceptive method in place and it has become effective. Condoms also help reduce the risk of sexually transmitted infections, which emergency contraception does not prevent.
If you took levonorgestrel, you can generally start or resume your regular hormonal contraceptive method immediately. After ulipristal acetate, you generally need to wait five days before starting or resuming a progestogen-containing hormonal method, because starting it too soon may reduce ulipristal's effectiveness. Ask a pharmacist or healthcare professional how long to use condoms or another backup method once your regular contraception resumes.
When should you seek medical care?
Contact a healthcare professional if your period is more than a week late, you have a positive pregnancy test, or you have persistent or unusual bleeding. Seek urgent medical care for severe or worsening lower abdominal pain, fainting, or heavy vaginal bleeding, particularly if pregnancy is possible. These symptoms need assessment rather than being assumed to be ordinary side effects.
If the sex occurred through assault or coercion, you can seek confidential medical support as soon as possible. Care may include emergency contraception, assessment for sexually transmitted infections, and discussion of other time-sensitive preventive care. You do not need to manage the situation alone.
Is emergency contraception the same as an abortion pill?
No. Emergency contraception is used to prevent pregnancy before it is established, mainly by delaying or preventing ovulation. It does not end an existing pregnancy and is not the same as medication used for abortion. If a pregnancy test is positive after emergency contraception, speak with a healthcare professional about your next steps.
Choosing a regular contraceptive method after emergency use
If this experience has made you consider a more reliable ongoing method, a healthcare professional can explain options such as contraceptive pills, implants, injections, hormonal IUDs, copper IUDs, and condoms. The best fit depends on your preferences, health history, convenience, and need for protection against sexually transmitted infections.
There is no need to feel embarrassed about needing emergency contraception for the first time. The practical priorities are to act within the appropriate time window, follow the medicine or procedure instructions, test for pregnancy at the right time, and choose ongoing protection that suits your needs.