Emergency Contraceptive Pills: Timing and Usage Guide - Obstetrics and Gynecology

More Info

---

Emergency contraceptive pills (ECPs) are a crucial option for preventing unintended pregnancies after unprotected intercourse or contraceptive failure. Understanding the timing and usage of these pills is essential for effective prevention.

ECPs, such as Plan B One-Step (levonorgestrel) and Ella (ulipristal acetate), are designed to be taken as soon as possible after unprotected sex. The effectiveness of these pills diminishes the longer you wait to take them. Levonorgestrel is most effective when taken within 72 hours (3 days), while ulipristal acetate can be effective up to 120 hours (5 days) after intercourse. However, both are not intended for regular contraceptive use and should not replace regular contraceptive methods.

In your case, you mentioned that you have been taking a birth control pill (referred to as "悅己口服") for 21 days and that your menstrual cycle started on November 1. If you are on a combined oral contraceptive pill, it is generally recommended to continue taking your pills as directed, which usually involves starting a new pack after a 7-day break. This break is when you typically have your withdrawal bleed, which mimics a menstrual period.

If you are considering starting a new pack of birth control pills on the third or fourth day of your menstrual cycle (around November 3 or 4), it is generally safe to do so. Most birth control pills can be started at any point in your cycle, but starting them during your period can help ensure that you are not pregnant, as the likelihood of conception is lower during this time. However, if you have any doubts or concerns, it is always best to consult with your healthcare provider for personalized advice.

It is also important to note that if you have had unprotected intercourse during the week before your period or during the first week of starting a new pack, you may need to use a backup contraceptive method (like condoms) for the first 7 days of taking the new pack. This is to ensure that you are adequately protected against unintended pregnancy.

In summary, you can start your new pack of birth control pills after your 7-day break, and starting it during your menstrual period is generally acceptable. However, if you have any concerns about potential pregnancy or the timing of your contraceptive methods, it is always best to consult with your healthcare provider for tailored advice. They can provide you with the most accurate information based on your health history and specific circumstances.