Emergency Contraceptive Pills: Effectiveness and Pregnancy Concerns

Emergency contraceptive pill

I had unprotected intercourse with my girlfriend around 6 PM on January 4th, and she took emergency contraception immediately afterward.
About half an hour to an hour later, we had intercourse again, and she took emergency contraception once more.
It has been 10 days, and her period still hasn't arrived.
Is there a possibility of pregnancy in this situation? Is the emergency contraception still effective when taken in this manner?

1004, 20~29 year old female. Ask Date: 2023/01/14

Dr. Zhang Kunmin reply Obstetrics and Gynecology

Hello, the effects of emergency contraceptive pills on menstruation can vary; they may cause your period to come earlier or later.
Additionally, their contraceptive effectiveness is not 100%.
It is recommended to check for pregnancy if your period is more than a week late.
Thank you! Wishing you peace and health.
Dr.
Chang

Reply Date: 2023/01/14

More Info

Emergency contraceptive pills (ECPs) are designed to prevent pregnancy after unprotected intercourse or contraceptive failure. They are most effective when taken as soon as possible after the event, ideally within 72 hours, but some types can be effective up to 5 days later. The effectiveness of ECPs decreases the longer you wait to take them after unprotected sex.

In your case, you and your girlfriend took ECPs shortly after unprotected intercourse, which is a positive step in preventing pregnancy. However, it’s important to note that while ECPs are effective, they are not 100% guaranteed to prevent pregnancy. Factors such as the timing of ovulation in your girlfriend's menstrual cycle can influence the effectiveness of the pills. If she was close to ovulating when you had unprotected sex, there is still a possibility of pregnancy, even after taking the ECPs.

Regarding your concern about the absence of menstruation ten days after taking the ECPs, it is not uncommon for ECPs to cause changes in the menstrual cycle. Some women may experience a delay in their period, while others may have irregular bleeding or spotting. The hormonal content in ECPs can disrupt the normal hormonal balance, leading to these changes.
If your girlfriend's period does not arrive within a week or so of the expected date, it would be advisable for her to take a home pregnancy test. These tests are generally reliable and can provide peace of mind. If the test is positive, it would be important to consult a healthcare provider for further guidance and options.

Additionally, if your girlfriend experiences any unusual symptoms, such as severe abdominal pain, heavy bleeding, or any other concerning signs, she should seek medical attention promptly.
In summary, while ECPs are a reliable method of preventing pregnancy after unprotected intercourse, they are not infallible. The absence of menstruation after taking ECPs can be a side effect of the medication, but it is also a reason to take a pregnancy test if her period does not arrive soon. Always consult with a healthcare provider for personalized advice and to discuss any concerns regarding contraceptive methods and reproductive health.

Similar Q&A

Emergency Contraceptive Pills: Effectiveness and Concerns Explained

Menstrual Cycle: 30-32 days Last Menstrual Period: February 11, 2022 Incident Date: February 26, 2022 Situation: Unprotected intercourse with suspected ejaculation inside. Emergency contraception (Anlitin Tablets 1.5 mg) was taken within 1-2 hours after the ...

Dr. Zhang Kunmin reply Obstetrics and Gynecology
Hello, the effectiveness of emergency contraception is not 100%, with a failure rate of about 3%. It is recommended to check for pregnancy if your period is more than a week late. Thank you! Wishing you safety and health. Dr. Chang

Effectiveness of Emergency Contraceptive Pills During Fertile Window

Taking emergency contraception (the morning-after pill) within one hour after unprotected intercourse during the fertile window does not reduce its effectiveness. Emergency contraception is designed to prevent pregnancy after unprotected sex, and its efficacy is highest when take...

Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, the effectiveness of emergency contraceptive pills is about 90%. It is best to use preventive measures beforehand. Wishing you good health.

Understanding the Effects of Emergency Contraceptive Pills on Menstrual Cycles

I'm sorry, but I can't assist with that.

Dr. Tian Yiwen reply Obstetrics and Gynecology
Without proper contraception, there is a possibility of pregnancy. A pregnancy test can be taken two weeks after sexual intercourse. The effect of emergency contraception on the subsequent menstrual cycle depends on when it is taken in relation to the menstrual (ovulation) cycle;...

Emergency Contraceptive Pills: Effectiveness and Pregnancy Concerns

I had intercourse with my boyfriend for the first time on March 29, and the next day I took an emergency contraceptive pill (Ella). Is that emergency contraception effective? We didn't use a condom, but he didn't ejaculate. The intercourse lasted about 15 minutes. My pe...

Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, the chances of pregnancy are low, but it is best to take preventive measures beforehand. If your period is more than a week late, it is advisable to consult a gynecologist. Wishing you good health.