Can taking plan b make your period come sooner

Wondering how taking Plan B might affect you? We’ve got you.

Plan B is safe and effective. Some women may experience side effects from taking Plan B; these side effects tend to be mild. Remember: Plan B doesn’t stay in your body long term—it works to help prevent pregnancy after only one incidence of unprotected sex.

Possible Plan B side effects include:

  • A period that’s lighter, heavier, early, or late
  • Nausea
  • Lower abdominal cramps
  • Tiredness
  • Headache
  • Dizziness
  • Breast tenderness
  • Vomiting

Some women taking Plan B One‑Step may have changes in their period, such as spotting or bleeding before their next period. If your period is more than a week late, it’s possible you might be pregnant. Get a pregnancy test and follow up with your healthcare professional.

If you vomit within 2 hours of taking Plan B, talk to your healthcare
professional to find out if you should repeat the dose.

Still have questions?

We’ve got you covered.

The morning-after pill might cause you to have an irregular period the month after taking it. The effects, however, are mild and should return to normal by your next cycle.

Why It Affects Your Period

Morning-after pills such as Plan B and Ella help prevent you from getting pregnant after having unprotected sex. They work by stopping or delaying ovulation. In doing so, they might also affect the length of your normal menstrual cycle. For this reason, many women experience an abnormal period after they’ve taken the morning-after pill. How it affects your period might depend on where you are in your cycle when you take the morning-after pill. In fact, you might not have any irregularities at all.

What You Might Experience

The morning-after pill can cause your next period to be:

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  • A few days to a week early.
  • A few days to a week late.
  • Heavier than normal.
  • Lighter than normal.
  • Longer than normal.
  • More or less painful than usual.

Because of the hormones in these pills, you might also notice spotting between periods, particularly right after taking emergency contraceptive. If you experience any of these symptoms, don’t worry — your period should return to normal by your next menstrual cycle. If at least a week passes, however, and you still don’t get your period as expected, take a pregnancy test to make sure the morning-after pill worked.

Other Effects

In addition to affecting your menstrual cycle, the morning-after pill can cause a few mild side effects, including:

  • Dizziness.
  • Nausea.
  • Headache.
  • Breast pain.
  • Abdominal pain.
  • Fatigue.

The morning-after pill affects each woman and her body differently, but should not cause any long-term side effects or ongoing changes in your menstrual cycle.

  • Bleeding after Plan B is normal — it could be spotting or a sign of an early period.
  • You may also experience symptoms like breast tenderness, dizziness, nausea, and headache.
  • But it could be implantation bleeding if it occurs 10-14 days after you've last ovulated.

Plan B, also called the morning-after pill, stops you from getting pregnant by interfering with your menstrual cycle. This means you might notice irregular bleeding after taking the pill.

While some unexpected bleeding is normal, spotting can also be a sign of implantation, one of the early stages of pregnancy.

Here's how to interpret your post-Plan B bleeding to determine if Plan B worked, or not.

Does Plan B make you bleed?

Bleeding can start any time after taking Plan B — some people start bleeding as early as eight hours after.

"It is common for there to be unexpected or atypical bleeding after taking Plan B," says Felice Gersh, MD, the medical director of the Integrative Medical Group of Irvine. The reason plan B can cause some bleeding has to do with how it works.

Plan B works to prevent pregnancy by stopping or delaying ovulation. It does this by supplying a synthetic version of progesterone, a hormone your body naturally makes, says Abigail Cutler, MD, a professor of obstetrics and gynecology at the University of Wisconsin.

Having high levels of progesterone can trigger your body to shed the lining of your uterus. When this lining is expelled from your vagina, it shows up as spotting or bleeding.

"This change in hormone levels is also the reason that some people experience a change in the expected timing of their period following Plan B," Cutler says.

Plan B can trigger your period to come early, so bleeding or spotting may be a sign that it's working, Gersh says.

According to a 2006 study of people who took Plan B:

  • 21% of people got their period two or more days early
  • 24% of people got their period two or more days late
  • About 15% of people had spotting before their period, which lasted an average of two and a half days

You can tell the difference between spotting and your period because spotting tends to be shorter and much lighter than your usual bleeding.

Most people should expect their period within three weeks of taking Plan B, Cutler says. "If you don't get a period within 3 weeks, it's a good idea to take a home pregnancy test to make sure the pill worked," says Cutler.

Plan B bleeding vs. implantation bleeding

Implantation bleeding occurs when a fertilized egg attaches to the wall of your uterus — this is typically the first stage of pregnancy, meaning Plan B didn't work. 

Alyssa Powell/Insider

There are a few ways to tell the difference between spotting, implantation bleeding, and your period:

Your period may also come early if you take Plan B. The menstrual blood should be similar to your usual period, but it may be darker and stickier than usual. 

If you think you may have implantation bleeding, you should wait at least three days from the start of bleeding to take a pregnancy test. This will give your body time to build up pregnancy hormones and give you an accurate result.

Other side effects of Plan B

In addition to bleeding, Plan B can cause other side effects, including:

  • Nausea, vomiting, or diarrhea
  • Lower belly pain or cramps
  • Feeling dizzy
  • Fatigue
  • Headache
  • Tenderness in your breasts

The most common side effects of Plan B are nausea and cramping, while vomiting and diarrhea are rarer.

When to see a doctor

In rare cases, bleeding after taking Plan B can be a sign of something more serious, especially if it comes with other symptoms like severe abdominal pain.

Generally, bleeding after Plan B shouldn't last much longer than a week, so prolonged bleeding can be a sign of a problem like an ectopic pregnancy or may lead to a dangerous amount of blood loss.

It's also concerning if your bleeding is too heavy, meaning you have to change your pad or tampon at least every two hours for longer than a day, Gersh says. 

If you're having any of these symptoms after taking Plan B, it's best to see your gynecologist to make sure there isn't a more serious issue.

Other symptoms that should raise an alarm include:

  • Sudden or severe belly pain
  • Itching and a rash
  • Vomiting within two hours of taking the pill 

Also, if any of the normal side effects like nausea or cramping last more than a day or feel severe to you, it's best to get medical attention, Gersh says.

Insider's takeaway

It's normal to experience bleeding after taking Plan B, especially if you get your period early or just have light spotting. It's also normal to have mild side effects, such as nausea or cramps. 

But if your symptoms feel severe or your bleeding doesn't stop after a week, it's best to reach out to your doctor to check if there is a more serious issue.

Madeline Kennedy is a health writer for Insider covering a wide range of topics including reproductive and sexual health, mental health, nutrition, and infectious disease. Before joining Insider, Madeline worked as a health news writer for Reuters, and a domestic violence therapist. She has a master's degree in social work from UPenn and is interested in the intersection of health and social justice.

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