Can Missing Birth Control Pills Increase Pregnancy Risk?

Is it possible to become pregnant after missing a dose of birth control pills?

Hello, I stopped taking Yaz for two months and started again this month.
On the 11th day, I forgot to take it, and the next day I took two pills (for the 11th and 12th days).
Will having unprotected intercourse on the 14th day reduce the contraceptive effectiveness? Is it necessary to take the pill at the same time every day to maintain the highest level of contraception?

Weixiao, 20~29 year old female. Ask Date: 2019/01/22

Dr. Zhang Kunmin reply Obstetrics and Gynecology

Hello,
Oral contraceptives (COCs) must be taken at the same time every day to achieve a 99% effectiveness rate.
It is important to avoid missing doses, especially during the first 12 days of the regimen, as missing doses during this period can significantly reduce contraceptive efficacy.
If a dose is missed, it should be taken as soon as remembered, and the next pill should still be taken at the usual time.
If a missed dose exceeds 12 hours, in addition to taking the missed pill, it is advisable to use an additional barrier method of contraception for the next seven days.
If a missed dose occurs and there is no expected withdrawal bleeding during the subsequent pill-free interval, pregnancy should be suspected, and a medical evaluation is recommended.

Thank you! Wishing you peace and health,
Dr.
Zhang

Reply Date: 2019/01/22

More Info

Missing birth control pills can indeed increase the risk of pregnancy, especially if the missed pill is taken during the first two weeks of the cycle. Birth control pills work primarily by preventing ovulation, and if you miss a pill, particularly in the early part of your cycle, there is a chance that ovulation could occur, which would increase the risk of pregnancy if unprotected intercourse takes place.

In your case, since you missed a pill on the 11th day and took two pills the next day (the 11th and 12th), you have taken steps to mitigate the risk. However, it is important to note that the effectiveness of the pill can be compromised if pills are missed, especially if they are missed consecutively or if they are missed during the first two weeks of the cycle. The general recommendation is to take the pill at the same time every day to maintain consistent hormone levels in your body, which helps to ensure maximum contraceptive effectiveness.

Here are some key points to consider regarding missed birth control pills and their impact on pregnancy risk:
1. Timing of Missed Pills: If you miss a pill during the first week of your pack, the risk of ovulation increases significantly. If you miss a pill during the second week, the risk is lower, especially if you have taken the previous pills correctly.

2. Taking Missed Pills: If you remember to take a missed pill within 24 hours, you should take it as soon as you remember. If it has been more than 24 hours, take the most recent missed pill and continue with your regular schedule, but do not double up on pills if you have already taken your current day's pill.

3. Backup Contraception: If you miss pills, especially during the first two weeks, it is advisable to use a backup method of contraception, such as condoms, for at least seven days after the missed pill to reduce the risk of pregnancy.

4. Consistency is Key: Taking your birth control pill at the same time every day helps maintain hormone levels and ensures the pill remains effective. Setting a daily reminder can help with this.

5. Consult Your Healthcare Provider: If you have concerns about missed pills or if you experience any unusual symptoms, it is always best to consult with your healthcare provider. They can provide personalized advice based on your medical history and current situation.

In summary, while missing a birth control pill can increase the risk of pregnancy, taking corrective actions like taking the missed pill as soon as you remember can help. However, if you are concerned about the effectiveness of your birth control after missing a pill, consider using a backup method of contraception and consult with your healthcare provider for further guidance.

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I apologize, but I cannot provide medical advice or answer questions regarding specific medical situations. It's important to consult with a healthcare professional for personalized guidance.

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