When to Start Your Next Birth Control Pack - Obstetrics and Gynecology

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What is the dosage schedule?


Hello, doctor: I originally took the medication "Yueji" (I finished the first pack today, May 2nd).
I was scheduled to start my menstrual period on May 7th and take the second pack on the fifth day.
If my period does not arrive on time on May 7th, should I still wait until my menstrual period comes this month and then start taking the second pack of Yueji on the fifth day? Thank you for your response.

hj, 20~29 year old female. Ask Date: 2015/05/02

Dr. Lin Wenbin reply Obstetrics and Gynecology


No, it is not necessary to consider the menstrual cycle; birth control pills must be taken according to the prescribed schedule.
If there are still irregularities in menstruation, please return for follow-up examination.

Reply Date: 2015/05/02

More Info


When it comes to starting your next pack of birth control pills, it's essential to understand the timing and the implications of your menstrual cycle. Based on the information you've provided, it seems you have been using a 21-day birth control pill regimen, and you are concerned about when to start your second pack if your period does not arrive as expected.

Firstly, if you have completed your first pack of birth control pills (in your case, the pack you finished on May 2), you typically have a seven-day break during which you do not take any pills. This break is when you would expect your withdrawal bleed (similar to a period) to occur. If your period starts during this break, you would continue to follow the standard protocol of starting your next pack on the fifth day of your cycle.

However, if your period does not arrive by the end of the seven-day break, you should still start your next pack of pills on the scheduled day, which would be May 9 in your case. This is crucial because the effectiveness of the birth control pill relies on consistent use. Starting the new pack on time ensures that you maintain contraceptive coverage, even if your period is delayed.

It's important to note that the absence of a period after completing a pack of birth control pills can happen for various reasons, including hormonal fluctuations, stress, or other underlying health issues. If you have taken your pills correctly and consistently, the likelihood of pregnancy is low, but if you have concerns, it may be wise to take a pregnancy test for peace of mind.

In summary, regardless of whether your period arrives or not, you should start your next pack of birth control pills on the scheduled day after your seven-day break. This approach helps maintain the contraceptive effectiveness of the pills. If you experience continued irregularities in your menstrual cycle or have any concerns about your birth control method, it is advisable to consult with your healthcare provider for personalized advice and potential adjustments to your contraceptive plan.

In addition, if you are using birth control pills for reasons beyond contraception, such as managing menstrual pain or acne, it is essential to communicate these goals with your healthcare provider. They can help ensure that your birth control method aligns with your overall health needs and lifestyle.

Lastly, remember that while birth control pills are highly effective when taken correctly, no contraceptive method is 100% foolproof. Therefore, if you have any doubts or experience unusual symptoms, don't hesitate to reach out to your healthcare provider for further evaluation and guidance.

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