Post-Pill Bleeding: Is It a Side Effect or a Concern? - Obstetrics and Gynecology

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Please help me with my question. Thank you?


On January 2nd, I was on the fifth day of my menstrual period.
The next day (January 3rd), I took the emergency contraceptive pill.
On January 7th, I experienced bleeding.
However, an hour before I noticed the bleeding, I had intercourse the previous day, so I took another pill, which means I took one while already experiencing bleeding.
After that, I bled continuously for 7 days (from January 7th to January 13th).
What could be the issue? Is this simply a side effect? I've heard that bleeding after taking emergency contraception could be a sign of infertility.
Is that true?

Gou Er, 10~19 year old female. Ask Date: 2016/01/17

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, taking emergency contraceptive pills can sometimes cause irregularities in your menstrual cycle.
It's best to use regular contraception methods beforehand, as it is not related to infertility.
Wishing you good health.

Reply Date: 2016/01/17

More Info


Post-pill bleeding, often referred to as withdrawal bleeding, can occur after taking emergency contraceptive pills (ECPs) such as Plan B or other forms of hormonal contraception. This bleeding is typically a response to the sudden influx of hormones introduced by the medication, which can disrupt the normal menstrual cycle. In your case, it appears that you experienced bleeding after taking the emergency contraceptive pill on January 3rd, followed by a prolonged period of bleeding for seven days.

To understand this situation better, it’s essential to consider a few key points:
1. Mechanism of Emergency Contraceptives: Emergency contraceptive pills primarily work by delaying ovulation, preventing fertilization, or inhibiting implantation of a fertilized egg. The hormones in these pills can cause changes in the uterine lining, which may lead to withdrawal bleeding similar to a menstrual period.

2. Timing of Bleeding: The timing of your bleeding (starting on January 7th) shortly after taking the emergency contraceptive pill is not unusual. Many women experience some form of bleeding after taking ECPs, which can vary in intensity and duration. The fact that you experienced bleeding for seven days is within the range of normal responses, although it may be longer than what some women experience.

3. Taking ECPs Multiple Times: You mentioned taking another dose of the emergency contraceptive pill while already experiencing bleeding. While taking ECPs again in this situation is not harmful, it is generally not necessary unless there is a concern about another potential pregnancy. The additional dose may further disrupt your hormonal balance, potentially leading to more irregular bleeding.

4. Concerns About Fertility: There is a common misconception that taking emergency contraceptive pills can lead to long-term fertility issues. However, research indicates that ECPs do not have lasting effects on fertility. They are designed for occasional use and do not affect future fertility when used as directed. If you are experiencing prolonged or heavy bleeding, it is advisable to consult with a healthcare provider to rule out any underlying issues.

5. When to Seek Medical Attention: If the bleeding is excessively heavy (soaking through a pad or tampon every hour for several hours), accompanied by severe pain, or lasts longer than a week, it is essential to seek medical attention. These could be signs of a more serious condition that needs evaluation.

6. Follow-Up: It’s a good idea to follow up with your healthcare provider, especially if you have concerns about your menstrual cycle or if this bleeding pattern continues in future cycles. They can provide personalized advice and may suggest further evaluation if necessary.

In summary, the bleeding you experienced after taking the emergency contraceptive pill is likely a side effect of the hormonal changes induced by the medication. It is generally not a cause for concern regarding future fertility. However, if you have ongoing issues or significant discomfort, consulting with a healthcare professional is recommended for further assessment and peace of mind.

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