How Effective is Birth Control When Taken on the Sixth Day? - Obstetrics and Gynecology

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When it comes to birth control and the timing of taking contraceptive pills, it's essential to understand how these medications work and the implications of starting them later than recommended. In your case, you started taking your birth control pill (in this instance, a combination pill like Alesse) on the sixth day of your menstrual cycle instead of the fifth day.

Effectiveness of Birth Control Pills
Birth control pills are most effective when taken consistently and as directed. Typically, when starting a new pack of pills, it is advised to begin taking them during the first five days of your menstrual cycle. This timing helps ensure that the body is adequately prepared to prevent ovulation. If you start taking the pill after this window, such as on the sixth day, the effectiveness may be compromised, especially if you have unprotected intercourse during this time.


What Happens When You Start Late?
1. Ovulation Prevention: Birth control pills primarily work by preventing ovulation. If you start taking the pill later than recommended, there is a risk that ovulation could occur before the pill has had time to take effect. This is particularly relevant if you had unprotected intercourse during the days leading up to and following your late start.

2. Sperm Viability: Sperm can live inside the female reproductive tract for up to five days. If you had unprotected intercourse from April 18 to April 21, and if ovulation occurs shortly after this period, there is a possibility of pregnancy, as viable sperm could still be present when an egg is released.


Should You Take Emergency Contraception?
Given that you had unprotected intercourse during the days you started the pill late, it may be prudent to consider taking emergency contraception (EC), especially if you are concerned about the possibility of pregnancy. Emergency contraception is most effective when taken as soon as possible after unprotected intercourse, ideally within 72 hours, but some forms can be effective up to five days after.


Continuing Birth Control
If you decide not to take emergency contraception, you should continue taking your birth control pills as prescribed. Consistency is key, and continuing the regimen will help restore your contraceptive protection. However, during this cycle, it may be wise to use a backup method, such as condoms, until you have taken the pills for at least seven consecutive days. This ensures that you are adequately protected against pregnancy.


Conclusion
In summary, starting your birth control pill on the sixth day of your cycle instead of the fifth can potentially reduce its effectiveness, particularly if you have had unprotected intercourse during that time. It is advisable to consider emergency contraception if you are concerned about pregnancy. Continue taking your birth control pills as directed and use a backup method until you are confident in the effectiveness of your contraception. If you have further concerns or experience any unusual symptoms, consult your healthcare provider for personalized advice.