First Time Taking Birth Control Pills: When to Start for Best Results? - Obstetrics and Gynecology

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First time taking oral contraceptives?


Hello Dr.
Tsao, this is my first time taking the oral contraceptive pill.
The instructions for Aivei suggest starting on the first day of my period or the first Sunday after my period begins.
I have found varying recommendations online; some doctors suggest starting on the first day, while others recommend starting on the fifth day of my period.
I would like to know, regardless of which day I start taking the pill, can I have unprotected intercourse the next day after taking just one pill?

Niming, 20~29 year old female. Ask Date: 2023/11/06

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, start taking the contraceptive pill on the fifth day of your menstrual period, and it will be effective as long as you take it.
Wishing you good health!

Reply Date: 2023/11/06

More Info


When it comes to starting birth control pills for the first time, timing is crucial for ensuring effective contraception. The general recommendation for most combination oral contraceptives is to begin taking the pill on the first day of your menstrual period. This method provides immediate contraceptive protection. If you start the pill on the first day of your period, you do not need to use additional contraception, such as condoms, for the first cycle.

However, if you choose to start the pill at a different time, such as during the first week after your period begins (often referred to as the "Sunday start"), it is important to note that you may not have immediate contraceptive protection. In such cases, it is typically advised to use an additional form of contraception, like condoms, for the first seven days of pill use to ensure you are fully protected against unintended pregnancy.

For those who are starting the pill for the first time, it is also essential to understand that the effectiveness of the pill can vary depending on when you start taking it. If you begin taking the pill after your period has started, you should wait at least seven days before relying solely on the pill for contraception. This is because it takes time for the hormones in the pill to build up in your system and provide effective ovulation suppression.

In your case, since you mentioned that the instruction manual for the birth control pill suggests starting on the first day of your period or the first Sunday after your period begins, it is advisable to follow the first-day start method if you want immediate protection. If you start on a different day, such as the fifth day of your period, you should be aware that you will not have full contraceptive protection until you have taken the pill consistently for seven days.

Additionally, it is important to take the pill at the same time every day to maintain consistent hormone levels in your body, which helps maximize the effectiveness of the birth control method. If you miss a pill, it is crucial to follow the instructions provided with your specific birth control pill regarding what to do next, as missing pills can increase the risk of pregnancy.

In summary, for first-time users of birth control pills, starting on the first day of your period is the best way to ensure immediate contraceptive protection. If you start on any other day, be prepared to use additional contraception for the first week. Always consult with your healthcare provider for personalized advice and to address any concerns you may have regarding your birth control method.

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