Impact of Delayed Start on Oral Contraceptive Effectiveness

Oral contraceptive pill issues?

Hello doctor, I would like to ask, I started taking the contraceptive pill for the first time two weeks ago, but I did not follow the instructions to start taking the first pill on the fifth day of my menstrual period; instead, I started taking it on the seventh day.
Will this affect the effectiveness of the contraception? Also, should I adjust the timing for the second month?

Lin, 20~29 year old female. Ask Date: 2019/10/10

Dr. Huang Jianzhong reply Obstetrics and Gynecology

I started taking the oral contraceptive for the first time two weeks ago, but I didn't follow the instructions to start taking the first pill on the fifth day of my period; instead, I began on the seventh day.
Will this affect the contraceptive effectiveness? Answer: The effectiveness will not be significantly compromised.
Should I adjust the timing for the second month? Answer: It is better to adjust the timing for the second month.

Reply Date: 2019/10/10

More Info

When it comes to the effectiveness of oral contraceptives, timing is crucial. Oral contraceptives, commonly referred to as birth control pills, work by regulating hormones to prevent ovulation, and their effectiveness can be influenced by when you start taking them in relation to your menstrual cycle.

In your case, starting the pill on the seventh day of your cycle instead of the recommended fifth day may impact its effectiveness, especially if you had unprotected intercourse during the first week of taking the pill. Generally, if you start taking the pill during the first five days of your menstrual cycle, it is effective immediately. However, if you start later, it may take up to seven days for the pill to become fully effective. This means that during this initial period, you should use a backup method of contraception, such as condoms, to prevent unintended pregnancy.

If you have already been taking the pill for two weeks, you should be aware that the effectiveness of the pill increases with consistent use. However, since you started a couple of days later than recommended, it is advisable to continue using a backup method until you have taken the pill consistently for at least seven days. After this period, the pill should provide reliable contraception as long as you continue to take it as directed.

Regarding your question about adjusting the timing for the second month, it is important to maintain a consistent schedule when taking oral contraceptives. You should take the pill at the same time every day to maximize its effectiveness. If you wish to adjust the timing, you can do so, but it is best to complete the current pack first and then start the next pack at your desired time. Just ensure that you do not miss any doses during the transition.

In summary, while starting the pill a couple of days later than recommended may have affected its initial effectiveness, continuing to take it consistently will help ensure reliable contraception moving forward. Always consult with your healthcare provider for personalized advice and to discuss any concerns you may have about your contraceptive method. They can provide guidance tailored to your specific situation and help you navigate any adjustments you may need to make.

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