the Timing for Starting Birth Control Pills: A Guide - Obstetrics and Gynecology

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Regarding emergency contraceptive pills?


Hello doctor, I started taking the 21-day oral contraceptive pill, Dailian 35, a month ago.
The obstetrician I consulted told me to take the first pill on the fifth day of my period.
However, I have also heard from many people that after stopping the pill for seven days, I should start a new cycle on the eighth day.
If I wait too long to take the pill, the contraceptive effect will be significantly reduced.
My current situation is that I stopped taking the pill on 10/26.
If I get my period four days after stopping (on 10/29), then the fifth day of my period would already be beyond the seven days after stopping the pill.
According to the seven-day rule, I should start taking the pills again on 11/1, but according to the fifth-day rule, I should start on 11/2.
Which guideline should I follow to take the oral contraceptive pill? Thank you.

Nìmíng, 20~29 year old female. Ask Date: 2015/10/26

Dr. Lü Lizheng reply Obstetrics and Gynecology


Both algorithms have similar processing times and are effective.
You can choose either one.
Sincerely, Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/10/26

More Info


When it comes to starting birth control pills, particularly combination oral contraceptives like Dailian 35, understanding the timing can be crucial for ensuring their effectiveness. Your question highlights a common point of confusion regarding when to begin a new cycle of pills after a break, especially in relation to your menstrual cycle.

Typically, the standard recommendation for starting birth control pills is to begin taking them on the first day of your menstrual period or, as you mentioned, on the fifth day of your cycle if you are following a specific protocol. The idea behind starting on the fifth day is to ensure that you are not pregnant and to provide immediate contraceptive protection. However, if you start the pills after your period has ended, it is generally advised to use an additional form of contraception (like condoms) for the first seven days to ensure you are protected against pregnancy.

In your case, you stopped taking the pills on October 26 and are concerned about when to start again, especially since your period may not arrive until October 29. If you follow the guideline of starting the pills on the fifth day of your period, you would begin taking them on November 2. However, if you consider the advice of waiting seven days after stopping the pills, you would start on November 1.
The key here is to prioritize the method that aligns with your healthcare provider's guidance. If your doctor has specifically instructed you to start on the fifth day of your period, then you should adhere to that. However, if you are concerned about the effectiveness due to the timing of your menstrual cycle, it may be wise to consult with your healthcare provider for personalized advice. They can provide clarity based on your individual health history and any other factors that may influence your contraceptive needs.

Additionally, it’s important to note that if you miss a pill or start late, the effectiveness of the birth control can indeed be compromised. If you find yourself in a situation where you have missed a pill or are unsure about when to start, using a backup method of contraception is advisable until you can confirm your protection status with your healthcare provider.

In summary, the best approach is to follow the guidance of your healthcare provider while also considering the timing of your menstrual cycle. If you have any doubts or if your situation changes, don’t hesitate to reach out to your doctor for further clarification. They can help you navigate the complexities of starting and maintaining effective birth control, ensuring that you have the best possible protection against unintended pregnancy.

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