Plan B Side Effects: What to Expect After Taking It
By: Celina Varga
Fact checked by: QA Team
Created on: August 6, 2025
0
18467
8 min
A complete guide to understanding Plan B side effects. Learn about common reactions like nausea and period changes, how to manage them, and when to see a doctor.
Introduction
Needing emergency contraception can be stressful, and worrying about what comes next doesn't help. This guide cuts through the confusion, offering a clear, compassionate look at Plan B side effects.
We'll cover what's normal, how to manage discomfort, and the signs that mean you should talk to a doctor. Our goal is to empower you with the information you need to take care of your body and mind.
Key Takeaways
- Most common Plan B side effects include nausea and fatigue, which typically resolve within a couple of days.
- Changes to your next menstrual period, like timing or flow, are very common and expected.
- Plan B does not provide protection against STIs or impact your long-term fertility.
- If you vomit within two hours of taking the pill or your period is over a week late, consult a healthcare provider.
Understanding the Basics of Plan B
Plan B One-Step is a form of emergency contraception, often called the "morning-after pill." It contains levonorgestrel, a synthetic hormone found in many birth control pills, but at a higher dose.
Its primary job is to prevent pregnancy after unprotected sex or contraceptive failure. It works mainly by delaying or preventing ovulation, so there's no egg for sperm to fertilize.
It is important to know that Plan B is not an abortion pill. It cannot terminate an existing pregnancy and will not harm a developing fetus.
Common Plan B Side Effects
The high dose of levonorgestrel can disrupt your body's natural rhythm, leading to some temporary side effects. Most are mild and don't last long, but knowing them can provide peace of mind.
The most frequently reported side effects include:
- Changes to your period: Your next period might arrive earlier or later than usual. It could also be heavier, lighter, or have more spotting than normal.
- Nausea and stomach pain: Some people feel queasy or have mild abdominal cramps after taking it.
- Fatigue: Feeling more tired than usual is a common hormonal response. Allow your body time to rest and recover.
- Headaches and dizziness: A temporary headache or feeling a bit dizzy can occur but should pass quickly.
- Breast tenderness: Your breasts might feel sore or sensitive, similar to pre-menstrual symptoms.
Less Common But Possible Reactions
While most reactions are mild, it's helpful to be aware of less common plan b side effects so you can respond appropriately if they happen.
Vomiting
A small number of people may vomit after taking the pill. According to the Mayo Clinic, if you vomit within two hours of taking Plan B, you should contact a healthcare provider to ask if another dose is needed.
Severe abdominal pain
While very rare, severe pain in your lower abdomen a few weeks after taking Plan B could be a sign of an ectopic pregnancy. This is a medical emergency, so seek care immediately if this occurs.
How to Manage and Alleviate Side Effects
If you experience side effects, a little self-care can go a long way. For nausea, try sipping ginger tea or eating small, bland snacks. Over-the-counter pain relievers can help with headaches or cramps.
Focusing on overall wellness can also help your body recalibrate. A balanced diet, like the personalized Mediterranean meal plans from no.Diet, supports stable energy and mood, which can be beneficial during hormonal fluctuations.
When to See a Doctor
Most side effects don't require medical attention. However, you should reach out to a healthcare professional in a few specific situations for your safety and well-being.
Contact your doctor or a clinic if:
- You vomit within two hours of taking the dose.
- Your period is more than seven days later than you expected.
- You experience sudden, severe, or persistent pain in your lower stomach.
- You have reason to believe you might be pregnant.
Myths vs. Facts About Emergency Contraception
Misinformation about emergency contraception is common. Let's clear up a few key points with guidance from experts like ACOG.
Myth: It harms future fertility.
This is false. Emergency contraception has no known long-term effects on your ability to get pregnant in the future when you are ready.
Myth: It’s a form of abortion.
This is incorrect. It works by preventing pregnancy from occurring. It does not affect a pregnancy that has already been established.
Myth: You can use it as regular birth control.
It is not designed for routine use. It's less effective than consistent methods like the pill or IUDs and carries a higher likelihood of temporary side effects.
Final Thoughts
Taking emergency contraception is a responsible health decision. Understanding the potential plan b side effects helps you know what to expect and manage the experience with confidence.
Remember that these effects are temporary. Be kind to your body, rest up, and don't hesitate to seek medical advice if you have any concerns about your health.
Ready to Build Healthier Habits?
Our guides and tools can help you take the next step in your wellness journey. Explore more expert advice on taking control of your health.
Explore Our Guides
Frequently Asked Questions
How long do Plan B side effects last?
Most side effects from Plan B are short-lived, typically lasting only one to two days. Changes to your menstrual cycle may only affect your next period.
How soon can you feel side effects from Plan B?
Side effects can begin within a few hours of taking the pill. However, some people may not notice any effects until the next day, or at all.
Is it normal to bleed after taking Plan B?
Spotting or light, irregular bleeding can be a side effect. This is not your period. According to Planned Parenthood, your actual period may then come earlier or later.
Can Plan B make you emotional?
Yes. The high dose of hormones can cause temporary mood swings, anxiety, or emotional sensitivity for some people, similar to premenstrual syndrome (PMS).
Comments
Loading comments...
Related Articles
Foods That Truly Support You During Your Period
Health6 min read
What Your Luteal Phase Symptoms Are Telling You?
Health7 min read
Zinc And Longevity: The Mineral That Fuels Vitality
Health8 min read
Why Thiamine Matters for Cravings and Aging Well
Health8 min read
Digital Therapeutics: The Rise of App‑Based Health Treatments
Health9 min read
TikTok Food Trends Taking Over 2025
Health6 min read