Irregular Bleeding After Starting Birth Control Pills - Obstetrics and Gynecology

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Emergency contraceptive pill


I started taking the birth control pill for the first time on October 25.
My period that time lasted only 2 days and then stopped.
During the week of November 9, I suddenly experienced a small amount of dark brown spotting.
On November 15, 16, and 17, there was a heavier flow, but it was still dark in color.
The bleeding lasted for about two weeks.
My period was expected on November 22, but it did not come.
Is this normal?

Niming, 20~29 year old female. Ask Date: 2015/11/25

Dr. Lü Lizheng reply Obstetrics and Gynecology


The response indicates that there may be slight irregularities in menstruation, and it is recommended to seek medical attention to confirm the cause.
Sincerely, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/11/25

More Info


Irregular bleeding after starting birth control pills is a common experience for many women, especially during the first few months of use. When you begin taking hormonal contraceptives, your body undergoes a period of adjustment as it acclimates to the new hormone levels. This adjustment can lead to various side effects, including irregular bleeding or spotting.

In your case, starting the birth control pills on October 25 and experiencing a short menstrual period followed by brown spotting and then heavier bleeding can be attributed to several factors:
1. Hormonal Adjustment: Birth control pills contain synthetic hormones that can alter your menstrual cycle. Initially, your body may respond with irregular bleeding as it adjusts to the new hormone levels. This is particularly common in the first three months of starting a new contraceptive method.

2. Breakthrough Bleeding: The brown discharge you experienced is often referred to as "breakthrough bleeding." This type of bleeding is usually lighter and can occur between periods. It is generally not a cause for concern unless it is heavy or accompanied by severe pain.

3. Missed Period: The absence of your expected period on November 22 could be due to the hormonal changes induced by the birth control pills. Some women may experience lighter periods or even skip periods altogether while on the pill, especially in the initial months.

4. Type of Birth Control Pill: Different formulations of birth control pills can have varying effects on menstrual cycles. Some pills are designed to provide more stable hormone levels, while others may lead to more fluctuations.

5. Other Factors: Stress, changes in weight, illness, or other medications can also influence your menstrual cycle and contribute to irregular bleeding.

While irregular bleeding can be normal, it is essential to monitor your symptoms. If the bleeding continues for an extended period, becomes heavy, or is accompanied by severe pain, it is advisable to consult with your healthcare provider. They may want to rule out other potential causes, such as infections, fibroids, or other underlying health issues.

In summary, experiencing irregular bleeding after starting birth control pills is common and often resolves as your body adjusts to the hormones. However, if you have concerns or if your symptoms change, seeking medical advice is always a good idea to ensure your health and well-being. Your healthcare provider can provide personalized guidance and may suggest alternative contraceptive methods if the current one does not suit your needs.

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