Emergency Contraception Calculator
Find out which emergency contraception options are still available to you and their effectiveness based on timing.
Emergency contraception can prevent pregnancy after unprotected sex, a missed pill or a broken condom — but every option has a time limit, and effectiveness drops the longer you wait. This tool uses the number of hours since unprotected sex and your cycle day to show which methods are still within their window (levonorgestrel up to 72 hours, ulipristal up to 120 hours, and the copper IUD up to 5 days) and roughly how effective each is right now. It is educational only; for a prescription or an IUD insertion, contact Dr. Neha Singhania promptly.
Time is Critical!
Emergency contraception is most effective when taken as soon as possible. If you need EC, please act quickly and consult a healthcare provider.
Enter Your Information
The first day you started bleeding in your last period
Understanding Emergency Contraception
Levonorgestrel (Plan B / i-Pill)
Progestin-only emergency contraceptive pill available over-the-counter
Ulipristal Acetate (Ella)
Selective progesterone receptor modulator - prescription required
Copper IUD (Cu-T 380A)
Most effective emergency contraception - inserted by healthcare provider
Key Points:
- • EC works best when taken as soon as possible after unprotected sex
- • EC pills prevent pregnancy - they do NOT cause abortion
- • Copper IUD is the most effective form of emergency contraception
- • EC does NOT protect against sexually transmitted infections
- • EC should not be used as a regular form of contraception
Emergency Contraception — FAQs
How soon after unprotected sex should I take emergency contraception?
The sooner the better. Levonorgestrel (i-Pill / Plan B) works best within 24 hours and up to 72 hours, ulipristal (Ella) up to 120 hours, and a copper IUD is highly effective up to 5 days after unprotected sex.
Which emergency contraceptive is the most effective?
The copper IUD is the most effective emergency contraceptive (over 99%) and also gives ongoing contraception. Among pills, ulipristal acetate is generally more effective than levonorgestrel, especially closer to ovulation or at higher body weight.
Does the morning-after pill cause an abortion?
No. Emergency contraceptive pills mainly work by delaying or preventing ovulation, so an egg is not released. They do not end an established pregnancy and will not harm an existing one.
Will emergency contraception affect my future fertility?
No. Emergency contraception has no lasting effect on your fertility. Your next cycle may come a little earlier or later than usual, but ovulation returns to normal afterwards.
Does emergency contraception protect against STIs?
No. Emergency contraception only reduces the risk of pregnancy. It offers no protection against sexually transmitted infections, so consider STI testing if there is any risk.