Emergency Contraceptive Pill Guide
Did we solve your problem?
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
| Criteria | Norlevo (Levonorgestrel) | EllaOne (Ulipristal) |
|---|---|---|
| Maximum window | 72 hours | 120 hours |
| Effectiveness at 24h | approx. 95% | approx. 98% |
| Effectiveness at 48h | approx. 85% | approx. 97% |
| Effectiveness at 72h | approx. 58% | approx. 95% |
| Prescription required | Prescription-only | Prescription-only |
| High BMI effect | Reduced effectiveness | Relatively 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