Do I Need Emergency Contraception After Using Pre-Pill? - Obstetrics and Gynecology

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If you had unprotected intercourse five days before your expected period and did not ejaculate inside, you may still want to consider taking emergency contraception. Emergency contraception is most effective when taken as soon as possible after unprotected intercourse. It is recommended to consult with a healthcare professional for personalized advice?


Hello Doctor, this is my first time taking a pre-exposure medication.
I started taking it on the first day of my menstrual period on April 23.
On April 27, the fifth day of my period, I had unprotected sex with my boyfriend, but he did not ejaculate.
After checking online, I found out that it takes 7 days for the medication to provide protection.
I want to buy emergency contraception but I'm unsure if it will affect the pre-exposure medication.
Should I buy the emergency contraception, or just continue taking the pre-exposure medication? If I need to take the emergency contraception, do I need to stop the pre-exposure medication? I apologize for the trouble, and thank you for your help.

Ms. Chen, 20~29 year old female. Ask Date: 2024/04/28

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, within the general safety zone, just observe this.
Wishing you good health.

Reply Date: 2024/04/28

More Info


When it comes to emergency contraception and the use of pre-conception pills (often referred to as birth control pills), it’s important to understand how these medications work and the timing involved in their effectiveness.

In your case, you started taking the birth control pill (Yaz) on the first day of your menstrual cycle, which is a common practice. When taken correctly, birth control pills can provide effective contraception after a certain period of consistent use. Typically, if you start taking the pill on the first day of your period, you are protected from pregnancy immediately. However, if you start taking the pill at any other time in your cycle, it usually takes about seven days for the pill to become fully effective.

Since you had unprotected intercourse on the fifth day of your cycle, and you had already been taking the pill for five days, you should be adequately protected against pregnancy, assuming you took the pill consistently and correctly during that time. The fact that your partner did not ejaculate inside you further reduces the risk of pregnancy, but it’s important to remember that pre-ejaculate fluid can contain sperm.

Regarding the use of emergency contraception (EC), such as Plan B or similar medications, it is generally not necessary if you have been taking your birth control pills correctly for five days and are within the window of protection. However, if you are feeling uncertain or anxious about the situation, taking emergency contraception is an option, but it is not typically required in your case.

If you decide to take emergency contraception, you do not need to stop taking your regular birth control pills. In fact, you can continue taking your birth control pills as prescribed. Emergency contraception works differently than regular birth control pills and is designed to prevent ovulation or fertilization after unprotected intercourse.

In summary, based on the information you provided, you should be protected against pregnancy due to the timing of your birth control pill usage. If you are still concerned about the possibility of pregnancy, you can consider taking emergency contraception, but it is not strictly necessary in this case. Always consult with your healthcare provider for personalized advice and to address any concerns you may have regarding your contraceptive methods. They can provide you with the most accurate information based on your specific health needs and circumstances.

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Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, generally, if you take your birth control pills on time, they are effective for contraception, and there is no need to take emergency contraception. Please continue taking your regular pills. Wishing you good health.

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