Emergency Contraception: What It Is, How It Works, and When to Use It

When you need to prevent pregnancy after unprotected sex or birth control failure, emergency contraception, a method used to prevent pregnancy after unprotected sex or contraceptive failure. Also known as the morning after pill, it’s not an abortion—it stops ovulation, fertilization, or implantation before pregnancy begins. Many people think it’s only effective the next morning, but timing matters more than the clock. The sooner you take it, the better it works—within 72 hours for most types, and up to 120 hours for some newer options.

There are two main types you’ll find in pharmacies: levonorgestrel, a synthetic hormone used in brands like Plan B One-Step, and ulipristal acetate, a stronger option sold as Ella that works longer and is more effective in people with higher body weight. Levonorgestrel is available over the counter, no ID needed. Ulipristal acetate requires a prescription but gives you more time. Neither works if you’re already pregnant, and neither protects against STIs.

Side effects are usually mild—nausea, tiredness, or a change in your period. Some people get spotting or cramping. If your period is more than a week late, take a pregnancy test. Emergency contraception isn’t meant for regular use. It’s a backup, not a replacement for condoms, birth control pills, or IUDs. If you’re sexually active and not trying to get pregnant, talk to a doctor about long-term options that are more reliable and easier to manage.

What you’ll find below are real, practical guides from people who’ve been there—whether it’s comparing Plan B to generic versions, understanding how weight affects effectiveness, or knowing what to do if you vomit after taking it. These aren’t theory pieces. They’re clear, no-fluff answers to the questions you actually ask when you’re stressed, confused, or in a hurry.