Emergency Contraception Options Explained

Emergency contraception reduces pregnancy risk after unprotected intercourse or contraceptive failure. Levonorgestrel pills are most effective within 72 hours; ulipristal acetate extends efficacy to 120 hours in many protocols.

Emergency pills primarily delay or inhibit ovulation—they are not abortion medications and do not terminate established pregnancies. A copper intrauterine device inserted within five days provides the highest efficacy and ongoing contraception.

Heavier menstrual bleeding or cycle shifts can occur temporarily. If a period is more than a week late, take a pregnancy test.

Repeated reliance on emergency pills suggests reviewing ongoing contraceptive plans with a clinician. Accessibility and cost barriers should not delay time-sensitive use.

Your options after unprotected sex

Emergency contraception can prevent pregnancy after unprotected sex, a missed pill, or a condom failure. Options include levonorgestrel pills (most effective the sooner they are taken, generally within 72 hours), ulipristal acetate pills (effective up to 120 hours), and the copper IUD, which is the most effective method and can be inserted within a few days by a clinician.

How it works and what to expect

Emergency contraceptive pills mainly work by delaying or preventing ovulation; they do not end an established pregnancy and will not harm one. Effectiveness is higher the earlier you act, and it can be reduced at higher body weight, in which case the copper IUD or ulipristal may be preferred. Your next period may come slightly early or late.

When to follow up

Take a pregnancy test if your period is more than a week late, and consider STI testing if the encounter carried that risk. Emergency contraception is for occasional use, not a replacement for a regular method.

What Emergency Contraception Actually Does

Emergency contraception (EC) works primarily by delaying or preventing ovulation. Without an egg available to be fertilised, pregnancy cannot begin. This is the dominant mechanism for all currently available forms of EC — levonorgestrel pills, ulipristal acetate pills, and the copper intrauterine device. Contrary to widespread belief, EC does not terminate an established pregnancy. Once a fertilised egg has successfully implanted in the uterine wall, EC has no effect. Labelling EC as an 'abortion pill' is therefore medically inaccurate.

A secondary mechanism sometimes discussed in older literature involves potential changes to cervical mucus or endometrial receptivity. Current evidence does not support the idea that these effects are clinically significant enough to prevent implantation in practice. The World Health Organization and major obstetric bodies worldwide endorse EC as a contraceptive — not an abortifacient — on the basis of this evidence.

Comparing Your Options: Pills vs. Copper IUD

Levonorgestrel pills (sold under brand names such as Plan B, Levonelle, and many generics) must be taken within 72 hours of unprotected sex, though effectiveness falls with each passing hour. At 95 % effective when taken within 24 hours, the rate drops to roughly 58 % between 48 and 72 hours. Body weight can reduce effectiveness for people over approximately 75 kg, making alternative options worth discussing.

Ulipristal acetate (ellaOne, ella) is available by prescription in most countries and maintains higher efficacy across the full 120-hour (five-day) window. It performs better than levonorgestrel in the 72–120-hour range and in people with higher body weight. The copper IUD is the most effective form of EC at over 99 % — it can be inserted up to five days after unprotected sex and then left in place as ongoing long-term contraception for 5–10 years.

Taking EC Pills Correctly

Both levonorgestrel and ulipristal acetate are single-dose pills taken orally. There is no need to split the dose or take pills on separate days — packaging that includes two tablets simply means both are taken together. Food does not significantly affect absorption, but if vomiting occurs within three hours of taking the pill, the dose should be repeated or an alternative method sought. Anti-nausea medication taken 30–60 minutes beforehand can help.

Avoid taking both types of EC together. Ulipristal acetate works partly by modulating the progesterone receptor, and taking levonorgestrel simultaneously blunts that action. If you have already taken a levonorgestrel pill and are unsure it will be effective, speak to a clinician about the copper IUD rather than adding a second hormonal agent.

After EC: What to Expect in Your Body

Many people experience no side effects at all. Others notice nausea, breast tenderness, headache, dizziness, or light spotting within the first day or two. Your next menstrual period may arrive up to a week earlier or later than usual — this is a normal hormonal response and not a sign of pregnancy. If your period is more than three weeks late, take a home pregnancy test.

EC does not provide protection against sexually transmitted infections. Using a barrier method — a condom — for the rest of your current menstrual cycle is wise both for infection prevention and as additional contraceptive cover, because ovulation may still occur later in the cycle after EC use. Resuming your regular hormonal contraception immediately after taking EC is appropriate; ask your pharmacist which pill-free intervals apply in your situation.

Common Myths Corrected

Myth: EC makes you infertile. Fact: EC does not affect future fertility in any way. Ovulation returns to its normal pattern within the next cycle. Myth: EC should only be used once. Fact: There is no medical reason to restrict use; however, because it is less effective and more expensive than regular contraception, repeated reliance on EC is not recommended as a primary strategy. Myth: You need a prescription for all forms of EC. Fact: Levonorgestrel pills are available over the counter in most pharmacies worldwide without a prescription.

When to Seek Medical Advice

Seek prompt clinical assessment if: you experience sudden severe abdominal pain after taking EC (this could indicate an ectopic pregnancy, especially if a prior pregnancy was recent); you believe your regular contraception may have failed multiple times; or you have a history of conditions such as severe liver disease, which can affect how EC is metabolised. The copper IUD requires insertion by a trained clinician, so arrange this as soon as possible — the five-day window closes quickly.

If you are breastfeeding, levonorgestrel is considered compatible with breastfeeding at the doses used in EC. Ulipristal acetate is excreted in breast milk; guidance varies by country, but many authorities recommend expressing and discarding milk for 24–36 hours after use. Discuss options with your midwife or GP.

Frequently Asked Questions

Q: Can I take EC if I am already on the pill? A: Yes. If you missed pills or had a pill interaction that left you at risk, taking EC is appropriate. Restart or continue your regular pill immediately after. Taking both does not cause harm, though effectiveness may be slightly altered with ulipristal acetate; the copper IUD is the most reliable option in this scenario.

Q: Will EC work if I am ovulating right now? A: EC is least effective when ovulation is already in progress or has just occurred. Levonorgestrel cannot reliably stop ovulation once the LH surge has peaked. The copper IUD, by contrast, works regardless of the stage of the cycle and is the most appropriate choice if you suspect ovulation has already happened.

Q: Is EC the same as the 'abortion pill'? A: No. The abortion pill refers to mifepristone combined with misoprostol, which is used to end an established pregnancy. EC prevents pregnancy from starting in the first place and has no effect after implantation.

Q: How soon after EC can I have sex again? A: There is no required waiting period. However, EC does not provide ongoing contraceptive protection. Use a barrier method or restart regular hormonal contraception before having sex again to avoid needing EC a second time.