What to Expect After Taking Emergency Contraception

by Eileen Bailey Health Writer

Realizing that you are at risk for an unplanned pregnancy is a scary experience. The time leading up to your next period can be filled with anxiety and worry. Thankfully, emergency contraception, sometimes referred to as the morning after pill, dramatically reduces the likelihood of an unwanted pregnancy — especially if taken shortly after unprotected sex.

How does the morning after pill work?

Emergency contraception helps prevent unplanned pregnancies. Reasons you might use emergency birth control include:

Taking emergency contraception does not end pregnancy that has already occurred, but it can prevent it from occurring in the first place. Depending on where you are in your monthly cycle, it might prevent or delay ovulation, block fertilization, or stop a fertilized egg from implanting in the uterus.

What choices are available for emergency contraceptive pills?

There are three types of emergency birth control pills available in the United States:

  1. Progestin only: These pills contain only the hormone progestin. They are sold under the names Plan B One-Step, Next Choice One Dose, Take Action, My Way, and more. It’s available over-the-counter to anyone of any age.

  2. Ulipristal acetate: Another option is a pill containing ulipristal acetate. It’s sold under the name “ella” in the United States and is available by prescription only.

  3. Progestin plus estrogen: Combined hormonal pills contain both progestin and estrogen — these are the typical daily birth control pills that you can get by prescription. Find out more about which brands can be used as emergency contraception, and how, from the Office of Population Research at Princeton University.

No matter which option you choose, it should be taken as soon as possible after unprotected sex. Plan B One-Step indicates it should be taken within 72 hours after sex; ella should be taken within 120 hours. But the sooner you take it, the better chance it works.

When will you get your next period?

You may experience some irregularities with your period after taking emergency contraception, but you should have a normal period within the following month, according to the Princeton University website for emergency contraception.

When your period arrives may be related to when you took the emergency contraceptive pill. Generally, women started their periods a day earlier when they used emergency contraception more than two days before ovulation, and their periods were two days later than expected when they took the pills more than two days after ovulation, according to a study completed at Princeton. Because taking the emergency contraceptive pill does not guarantee that you won’t get pregnant, you should take a pregnancy test if your period is more than a week late.

You may also notice some spotting after taking the medication and before your next period. You might notice that your first period is lighter or heavier than normal. This should resolve by the following month.

What are the side effects of emergency contraception?

The most common side effects, according to Princeton University, include:

  • Nausea.

  • Abdominal cramps.

  • Fatigue.

  • Headache.

  • Dizziness.

  • Breast tenderness.

Around 20 percent of women experience vomiting after taking the morning after pill. If vomiting occurs within two hours of taking the medication, you should contact your doctor as it's possible that the medication was not absorbed and you'll need an additional dose. If vomiting occurs within one hour of taking the emergency contraceptive pill, it's generally recommended that an anti-nausea medication be given and the emergency contraceptive pill be given again.

Eating small meals, using easily digestible foods, and avoiding dehydration can help, but often the nausea is unavoidable. Medications that help reduce nausea can be given either before nausea develops or to treat nausea. The nausea tends not to last very long, and most women feel better by the next day.

When to see a doctor

  • If you vomit within two hours of taking the medication.

  • If your period is more than one week late.

  • If you experience severe abdominal pain.

Are there non-pill options for emergency birth control?

Another form of emergency contraception is the copper intrauterine device (IUD). If inserted within five days of unprotected sex, it can prevent pregnancy, according to the American College of Obstetricians and Gynecologists. The added benefit is it will then provide up to 10 years of long-term birth control.

Eileen Bailey
Meet Our Writer
Eileen Bailey

Eileen Bailey is an award-winning author of six books on health and parenting topics and freelance writer specializing in health topics including ADHD, Anxiety, Sexual Health, Skin Care, Psoriasis and Skin Cancer. Her wish is to provide readers with relevant and practical information on health conditions to help them make informed decisions regarding their health care.