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Emergency Contraceptive Pill Guide

Check pill effectiveness and golden window based on time elapsed and pill type (Levonorgestrel / Ulipristal).

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What is the Emergency Contraceptive Pill Calculator?

A calculator that estimates contraceptive effectiveness based on when you take the emergency pill after unprotected intercourse. It compares two types of medication, Levonorgestrel and Ulipristal, and provides essential information about menstrual changes after use, when to take a pregnancy test, and when to seek immediate medical attention. All information is for reference only and does not replace professional medical advice.

Levonorgestrel vs Ulipristal Comparison

CriteriaNorlevo (Levonorgestrel)EllaOne (Ulipristal)
Maximum window72 hours120 hours
Effectiveness at 24happrox. 95%approx. 98%
Effectiveness at 48happrox. 85%approx. 97%
Effectiveness at 72happrox. 58%approx. 95%
Prescription requiredPrescription-onlyPrescription-only
High BMI effectReduced effectivenessRelatively less affected

Menstrual Changes After Taking the Pill

Changes in your menstrual cycle after taking emergency contraception are normal. Levonorgestrel may shift your period up to a week earlier or later, while Ulipristal tends to cause delays.

Spotting may occur after taking the pill, but this is a side effect and not menstruation. If you vomit within 3 hours of taking the pill, it is assumed the medication was not absorbed and you should return to a clinic immediately.

When to Seek Medical Attention Immediately

Seek medical attention immediately if you experience any of the following: severe lower abdominal pain; vomiting within 3 hours of taking the pill; your period is more than 2 weeks late. Take a pregnancy test if your period is more than 1 week overdue. Taking the pill more than twice in one cycle is strongly discouraged due to hormonal disruption and increased failure rates.

Recommended For

  • Emergency situation: When contraception failed or unprotected intercourse occurred
  • Medication comparison: When deciding between Levonorgestrel and Ulipristal
  • Time check: When you want to know effectiveness based on hours elapsed since intercourse
  • Test timing: When you need to know when to take a pregnancy test after the pill
  • Prescription info: When you want to understand emergency contraceptive prescription requirements in Korea

Frequently Asked Questions

No. In Korea emergency contraceptive pills are prescription-only medications. You must visit a gynecologist or emergency room and obtain a prescription from a doctor.

No. Proxy prescriptions are illegal under Korean law. The person who will take the medication must attend the consultation in person.

Yes. In Korea it is treated as an emergency medical procedure and minors can receive a consultation without guardian consent. Your privacy is fully protected.

This is not recommended. Emergency contraceptive pills contain roughly 10 times the hormone dose of regular birth control pills. Repeated use disrupts hormonal balance and significantly increases the failure rate.

No. Effectiveness is highest the sooner you take it, with up to 98% within 24 hours, but 100% is never guaranteed. Take a pregnancy test 3 weeks after taking the pill or if your expected period does not arrive.