I Took Plan B and Haven’t Started My Period: What Should I Do?

plan b no period

Taking emergency contraception, such as Plan B, is a common choice for women who want to prevent an unplanned pregnancy after unprotected sex or contraceptive failure. However, it’s natural to feel concerned if you’ve taken Plan B and your period hasn’t arrived as expected. In this article, we will address the common concerns and provide guidance for women who find themselves in this situation.

Understanding Plan B

Plan B, also known as the “morning-after pill,” is a form of emergency contraception that contains levonorgestrel. It is designed to prevent pregnancy when taken within 72 hours (or up to 120 hours in some cases) after unprotected sex or contraceptive failure. Plan B works by primarily preventing or delaying ovulation, and it may also affect the lining of the uterus to make it less receptive to implantation.

Potential Causes for Delayed Period

It’s important to note that Plan B can sometimes disrupt your regular menstrual cycle, causing your period to be delayed or come earlier than expected. There are several factors that can contribute to this delay:

  1. Hormonal Imbalance: The high dose of levonorgestrel in Plan B can temporarily alter your hormone levels, which may affect the timing of your period.
  2. Stress and Anxiety: Experiencing anxiety or stress due to the emergency situation, fear of pregnancy, or concerns about the effectiveness of Plan B can impact your menstrual cycle.
  3. Normal Variations: Menstrual cycles can naturally vary in length, and even small changes can cause delays.

Steps to Take

If you’ve taken Plan B and your period hasn’t arrived as expected, here are some steps you can take:

  1. Don’t Panic: Remember that delayed periods are not uncommon after taking emergency contraception. Try to stay calm and avoid unnecessary stress, as stress itself can further delay your period.
  2. Take a Pregnancy Test: If you are concerned about the possibility of being pregnant, take a pregnancy test here at our clinic about three weeks after unprotected sex or contraceptive failure. This will help alleviate any uncertainties and give you a clear understanding of your situation.
  3. Consult a Healthcare Provider: If you have taken Plan B, followed the instructions correctly, and have not experienced any pregnancy symptoms but are still worried, it is advisable to consult a healthcare provider. They can provide personalized advice based on your specific circumstances. Make an appointment here.
  4. Track Your Symptoms: Keep a record of any changes or symptoms you experience after taking Plan B. This information will be helpful when discussing your concerns with a healthcare professional.


Taking Plan B can disrupt your menstrual cycle, causing a delay in your period. While it is natural to be concerned, it’s essential to stay calm and understand that this delay is often a temporary effect of the emergency contraceptive. If you are worried about pregnancy, taking a pregnancy test after three weeks is advisable. Remember, consulting a healthcare provider is always a wise decision when seeking personalized guidance and addressing any concerns you may have.

If you are in the Las Vegas area, you can make a care plan appointment here.