The short explanation
At four days, some options may still work. One type of emergency pill is licensed for use up to three days after sex, and another type up to five days. Both work better the sooner they are used. A copper IUD inserted by a doctor within about five days of sex is the most effective emergency option, preventing almost all pregnancies, and it then provides ongoing contraception. At this point, the copper IUD is often the best choice if it is available and suits you. If not, ask a pharmacist or doctor which emergency pill is suitable at four days. Go today, as time matters.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Emergency pills work mainly by delaying ovulation; if ovulation has already happened, they may not work.
- Body weight can affect how well some emergency pills work; a doctor can advise.
- Do a pregnancy test about three weeks after the sex, or if your period is late.
- Government hospitals and family planning clinics may provide copper IUD insertion free.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot tell which option is best for you. A doctor or pharmacist can advise based on your timing and health.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Which emergency option works at four days?
- Can I have a copper IUD inserted today?
- When should I do a pregnancy test?
- Should I be tested for infections?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Get help the same day
- Get emergency contraception today, as the time window is closing.
Book an appointment soon
- Do a pregnancy test about three weeks after the sex.
Raise it at a routine appointment
- Book a routine appointment to start regular contraception.
Sources
The evidence this explanation is built on.
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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