Does plan b mess up period?

If you’re looking for a quick answer to whether or not Plan B messes up your period, then let’s just cut the chase and say yes. But don’t panic because this article is here to break down all the nitty-gritty details of what actually happens when you take emergency contraception.

What is Plan B?

For those who might not know, Plan B (also known as levonorgestrel) is an emergency contraceptive pill that can prevent pregnancy if taken within three days after unprotected sex or birth control failure. It works by delaying ovulation, thins out the uterine lining, and thickens cervical mucus so sperm cannot reach an egg.

How Does it Affect Your Menstrual Cycle?

Now back to our main question- how exactly does taking Plan B affect your period? To understand this better we need to look at how your menstrual cycle works.

Your menstrual cycle is controlled by two hormones called estrogen and progesterone produced in your ovaries. These hormones regulate ovulation — release of eggs from the ovaries which are necessary for pregnancy. If fertilization doesn’t occur, a drop in estrogen levels triggers menstruation – shedding of endometrial lining through vaginal bleeding usually lasting for 3-7 days.

Taking plan b interferes with these hormonal fluctuations causing:

  1. Delayed or Early Periods

Plan b can alter timing of ovulation making periods come earlier/later than expected (usually within two weeks).

  1. Light or Heavy Bleeding

Plan b may cause unusual flow ranging from light spotting/pinkish discharge to heavy bleeding/clotting.

• Example bullet listing what kind of irregularities:
Blood clots
Body ache

  1. Change In Flow Duration

Period length can be affected too by varying a few days.

• Example table:

Day of Cycle Onset of Menstruation
21-24 Light Flow
25-28 Moderate Flow

Can Plan B Affect Your Fertility?

A common concern among many women is whether emergency contraception has any effect on future fertility. There’s no conclusive evidence to support this claim as long-term hormonal contraceptive usage may cause temporary irregularities in menstrual cycles, but ultimately does not hinder fertility.

Other Side Effects Of Plan B

Apart from menstrual irregularities, the following side effects can occur after taking plan b.

  1. Nausea/Vomiting
  2. Fatigue or Tiredness
  3. Abdominal pain/cramps
  4. Breast tenderness/soreness

It’s worth noting that these side effects are relatively minor and typically disappear within a couple of days.

How To Help Ease Discomfort Caused By Menstrual Irregularities After Taking Plan B?

If you’re experiencing unusual symptoms after taking emergency contraception, there are several things you can do to alleviate discomfort.

  1. Ibuprofen or other nonsteroidal anti-inflammatory pain relievers
    2.Coconut oil – contains monolaurin which has antiviral properties and acts like an anti-inflammatory making its use helpful for cramping pains.
    3.Wear comfortable loose clothes
    4.Take plenty of fluids

Should You Be Worried?

It’s important to remember that every woman is different when it comes to their reaction to pregnancy prevention methods such as Plan B Emergency Contraception pill., so period changes will therefore vary by individual experience and should not be worrisome unless prolonged continuance past the normal time range.


In conclusion, Yes!, plan b can mess up your period since it affects complex hormonal interactions involved in menstrual cycle regulation leading to irregular bleeding. It is important to keep tabs on how your body reacts post-consumption of emergency contraception as well as monitoring other symptoms that might accompany the change in flow regularity, and notify a healthcare professional when necessary.

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