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Understanding the Effects of Plan B: Can it Cause Your Period to Come 2 Weeks Early?



Many women have experienced the frustration of missing their period, hoping it will comeIn this article, we’ll explore the science behind Plan B and its potential effects on your menstrual cycle. soonthanexpected? andtwoweeks earlier worrying if it’s late. But what would you do if your period came early?

What is Plan B

Plan B is an alternative form of emergency contraception that can be taken after unprotected sex or if a contraceptive fails, such as a broken condom. It is also known as the morning-after pill and contains the hormone levonorgestrel, which works to prevent pregnancy by preventing ovulation or fertilization of an egg. Plan B can be taken up to 72 hours after unprotected sex but is most effective within the first 24 hours.

Potential effects of Plan B on menstrual cycle

Plan B may have an effect on your menstrual cycle by delaying or advancing the timing of your period. It is likely that taking Plan B will cause a delay in your next period, as it works to suppress ovulation and therefore could interfere with the natural cycle.

How Plan B Works

Mechanism of action

Plan B works primarily by preventing ovulation or fertilization of an egg. The active ingredient in Plan B, levonorgestrel, is a synthetic hormone that acts similar to the body’s natural progesterone. It works to suppress the release of luteinizing hormones from the pituitary gland, which triggers ovulation.

Timing of ovulation and conception

Ovulation is the release of an egg from the ovary that occurs approximately 14 days before a woman’s period begins. If fertilization does not take place, the lining of the uterus will shed and a menstrual period will occur in about 28 days.

Possible Changes in Menstrual Cycle

Normal menstrual cycle length

The length of a normal menstrual cycle is typically between 21 and 35 days, with an average cycle length of 28 days. The length of the menstrual cycle is determined by the time it takes for an egg to mature, be released from the ovary (ovulation), and then travel through the fallopian tubes to the uterus.

Factors that can affect menstrual cycle length

Several factors can affect the length of a menstrual cycle, including age, stress, lifestyle choices, and certain medications. In addition to these external factors, there are also natural changes in hormone levels throughout a woman’s menstrual cycle that can influence the length of her period.

Research on the effects of Plan B on menstrual cycle

Research has found that taking Plan B can have some effects on a woman’s menstrual cycle, but these are generally only temporary and should not affect a woman’s long-term fertility. While taking Plan B may result in an earlier or later period than usual, this is typically only a result of a delay in ovulation and should not cause any long-term changes to the menstrual cycle. Therefore, while it is possible that taking Plan B could cause your period to come two weeks early, this effect is generally only temporary and should not significantly affect your long-term fertility or health.

Can Plan B Make Your Period Come Early?

Personal experiences and anecdotes

There have been many anecdotal reports from women who have taken Plan B and experienced their period coming early. For some women, this is a welcomed effect of taking the morning-after pill as it can provide relief from the physical symptoms associated with their menstrual cycles, such as cramps and bloating.

Scientific studies and findings

Scientific studies have attempted to examine the effects of Plan B on menstrual cycles, with conflicting results. A 2018 systematic review found that taking Plan B could result in a shorter menstrual cycle, although the exact mechanism is still unclear. Other studies have reported delays of up to 12 days from when Plan B was taken until the onset of menstruation.

Factors to Consider

Individual variations in response to Plan B

Due to individual variations in hormone levels and physiology, the effects of Plan B on a woman’s menstrual cycle can vary greatly from person to person. While some women may experience their period coming early after taking the morning-after pill, this is not necessarily the case for all women.

Other factors that can impact menstrual cycle

In addition to taking Plan B, there are several other factors that can impact a woman’s menstrual cycle and the timing of her period. These include lifestyle choices such as diet, exercise, and smoking, as well as any underlying medical conditions such as polycystic ovary syndrome (PCOS) or thyroid disorders.


The research on the effects of Plan B on menstrual cycles is mixed, and results can vary significantly from person to person. For some women, taking Plan B may result in their period coming early, however this is not necessarily the case for all women. In addition to Plan B, lifestyle choices such as diet and exercise, as well as underlying medical conditions such as PC OS or thyroid disorders can also affect menstrual cycle length. It is important to discuss any concerns about menstrual cycle irregularities with a healthcare provider.

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