Missed Birth Control Pills: Breakthrough Bleeding and Effectiveness - Obstetrics and Gynecology

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Breakthrough bleeding after missing a dose of emergency contraception?


On the sixth day of my period in March, I started taking the birth control pill (it was my first time).
On March 21 (the 16th day of taking the pill), I forgot to take the pill for two consecutive days and then stopped taking it.
My period started on March 27 (the sixth day after stopping the pill).
I began a new pack of birth control pills on April 1.
On April 10, I forgot to take a pill, and on April 11 (the 11th day of taking the pill), I experienced brown spotting.
I took two pills that day, but the spotting continued until April 16, when it turned into a small amount of red bleeding.
Since April 11, I have been taking the pills consistently without missing any.

Doctor, does this still provide contraceptive effectiveness? Should I continue taking the birth control pills or stop? Is the bleeding normal? Is it also normal to experience abdominal pain and breast tenderness during this time? Thank you, doctor.

Niming, 10~19 year old female. Ask Date: 2020/04/16

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, it should still have contraceptive effects.
Please observe for a while, and if there is no improvement, I recommend trying a different type of contraceptive pill.
Wishing you good health.

Reply Date: 2020/04/16

More Info


When it comes to missed birth control pills and the resulting breakthrough bleeding, it's essential to understand how hormonal contraceptives work and what effects missing doses can have on your body. Birth control pills contain hormones that regulate your menstrual cycle and prevent ovulation. When taken consistently, they are highly effective at preventing pregnancy. However, missing doses can disrupt this hormonal balance, leading to unexpected side effects such as breakthrough bleeding.

In your case, you started taking birth control pills on the sixth day of your menstrual cycle. After missing two pills, you experienced a withdrawal bleed, which is similar to a period, when you stopped taking the pills. This is a common occurrence when you miss doses, as your body reacts to the sudden drop in hormones. The subsequent breakthrough bleeding you experienced on April 11, after missing another pill, is also a typical response. Breakthrough bleeding can happen for various reasons, including hormonal fluctuations due to missed pills, and it can manifest as light spotting or heavier bleeding.

Regarding your question about contraceptive effectiveness after missing pills, it's important to note that missing two consecutive pills can reduce the effectiveness of the birth control method. The general recommendation is to use backup contraception, such as condoms, for at least seven days after missing pills to ensure protection against pregnancy. Since you resumed taking your pills consistently after the missed doses, you should be protected again after a week of taking the pills correctly.

As for whether you should continue taking the pills or stop, it is advisable to continue taking them as prescribed. Stopping the pills can lead to further hormonal imbalances and may prolong any irregular bleeding. If the breakthrough bleeding continues or if you experience significant discomfort, such as abdominal pain or breast tenderness, it would be wise to consult with your healthcare provider. They can assess your symptoms and determine if your current birth control method is suitable for you or if adjustments are necessary.

It's also worth noting that breast tenderness and abdominal discomfort can be common side effects of hormonal contraceptives, especially during the initial months of use or after missed doses. These symptoms typically resolve as your body adjusts to the hormones in the pills.

In summary, continue taking your birth control pills as directed, use backup contraception for at least a week after missed doses, and monitor your symptoms. If you have ongoing concerns about breakthrough bleeding or any discomfort, don't hesitate to reach out to your healthcare provider for personalized advice and support. They can help ensure that you are using the most effective and suitable contraceptive method for your needs.

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Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, it should be due to a missed dose. Just monitor the situation, but you should take additional contraceptive measures. Wishing you good health.

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