When to Start Taking Birth Control After Emergency Contraceptive? - Obstetrics and Gynecology

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When considering the use of birth control after taking emergency contraception, it's important to understand the timing and the mechanisms involved in both methods. Emergency contraceptive pills (ECPs), such as Plan B or Ella, are designed to prevent pregnancy after unprotected intercourse or contraceptive failure. They work primarily by delaying ovulation, preventing fertilization, or preventing implantation of a fertilized egg.

If you took emergency contraception on April 18 and then experienced your menstrual period shortly thereafter, it is generally safe to start taking regular birth control pills immediately after your period begins. In your case, since you mentioned that your last menstrual period started on April 18, you can begin taking your regular birth control pills as soon as your period starts. This is often recommended because starting the pill during your period can help ensure that you are not pregnant and can provide immediate contraceptive protection if you start taking it during the first five days of your cycle.

However, if you start taking the birth control pill after your period has ended, it is advisable to use a backup method of contraception, such as condoms, for the first seven days of taking the pill. This is to ensure that you are fully protected against pregnancy, as it takes about seven days for the hormonal contraceptive to become effective.

It's also important to consider the type of birth control you are planning to use. If you are using combination pills (which contain both estrogen and progestin), starting them during your period is a common practice. If you are using progestin-only pills, the timing can be a bit more flexible, but you should still follow the guidance of your healthcare provider.

In summary, you can start taking your regular birth control pills after your period begins on April 18. If you begin taking them after your period, remember to use a backup method for the first week. Always consult with your healthcare provider for personalized advice and to discuss any concerns you may have regarding your reproductive health and contraceptive options. They can provide you with the most accurate information based on your individual health history and circumstances.