Starting Birth Control Pills: Timing and Considerations for New Users - Obstetrics and Gynecology

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Use of contraceptive pills


Hello, doctor.
I have never used birth control pills before and have not been sexually active.
This month, I started taking the birth control pills on the first Sunday after my period began, which was a week later (so I started on the ninth day, unlike the usual first or fifth day).
Could you please let me know if there are any issues with this? Thank you for taking the time to answer.

yy, 20~29 year old female. Ask Date: 2005/03/12

Dr. Zhong Wenzhen reply Obstetrics and Gynecology


The function of oral contraceptives is to simulate the natural secretion of ovulatory hormones by administering artificial hormones before the onset of the ovulation cycle, thereby suppressing natural ovulation.
If oral contraceptives are started too late (more than 5 days after ovulation), the body's natural ovulation mechanism will not be inhibited, and even if the entire pack of contraceptives is taken, it will not achieve the intended contraceptive effect.

Reply Date: 2005/03/12

More Info


Starting birth control pills is an important decision that requires careful consideration of timing and individual health circumstances. When it comes to initiating hormonal contraceptives, understanding the timing of when to start taking the pills can significantly impact their effectiveness and your overall reproductive health.

In your case, beginning the birth control pills on the ninth day of your menstrual cycle, which is after your period has started, is a common practice known as the "Sunday Start" method. This method allows users to begin taking the pills on a specific day of the week, which can help with adherence and convenience. However, it is essential to note that starting the pills at this time means that you may not be fully protected against pregnancy for the first seven days of taking the pills.

Typically, there are two main ways to start taking birth control pills:
1. First-Day Start: This involves starting the pill on the first day of your menstrual period. If you begin taking the pill this way, you are immediately protected against pregnancy.

2. Sunday Start: This method allows you to start taking the pill on the first Sunday after your period begins. If you choose this method, you will need to use an additional form of contraception, such as condoms, for the first seven days of taking the pill to ensure effective pregnancy prevention.

Since you started taking the pills on the ninth day of your cycle, it is crucial to consider that you may not have full contraceptive protection until you have taken the pills consistently for seven days. Therefore, if you engage in sexual activity during this initial week, there is a risk of unintended pregnancy. It is advisable to use a backup method of contraception, such as condoms, during this time.

Additionally, it is essential to be aware of potential side effects when starting birth control pills. Common side effects may include nausea, breast tenderness, mood changes, and breakthrough bleeding. These side effects are often temporary and may subside after a few months of consistent use. However, if you experience severe side effects or have concerns about your health, it is crucial to consult with your healthcare provider.

Moreover, it is important to discuss any pre-existing health conditions or medications you are currently taking with your healthcare provider before starting birth control pills. Certain medical conditions, such as a history of blood clots, hypertension, or migraines, may influence the type of birth control that is best suited for you.

In summary, starting birth control pills on the ninth day of your cycle may not provide immediate contraceptive protection, and it is advisable to use a backup method for the first seven days. Always consult with your healthcare provider for personalized advice and to ensure that you are making the best choice for your reproductive health. They can provide you with comprehensive information about the different types of birth control available, their effectiveness, and any potential risks associated with their use.

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