Emergency Contraception: Timing and Side Effects Explained - Obstetrics and Gynecology

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Emergency contraception


This morning between 10:00 and 11:00, the condom broke while I was having intercourse with my boyfriend.
I took 1.5 mg of emergency contraception (Ella) around 2 PM.
I am now experiencing symptoms of fatigue and headache, and I'm really worried that I might be pregnant.
Is it too late to take the pill?

Xiao, 10~19 year old female. Ask Date: 2015/10/18

Dr. Lü Lizheng reply Obstetrics and Gynecology


The medication is effective when taken within 72 hours.
Sincerely, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/10/18

More Info


Emergency contraception (EC) is a critical option for individuals who may have had unprotected intercourse or contraceptive failure, such as a broken condom. In your case, taking the emergency contraceptive pill (ECP), commonly known as "Plan B" or "Ella," after a condom failure is a responsible choice.
The timing of taking emergency contraception is crucial for its effectiveness. The sooner you take it after unprotected intercourse, the better. ECPs are most effective when taken within 72 hours (3 days) after the incident, but some types, like ulipristal acetate (Ella), can be effective up to 120 hours (5 days) after unprotected sex. Since you took the ECP approximately 4 hours after the incident, you are within the effective window, and it should significantly reduce your risk of pregnancy.

Regarding the side effects you are experiencing, such as fatigue and headaches, these are common reactions to emergency contraceptive pills. Other potential side effects can include nausea, breast tenderness, dizziness, and changes in your menstrual cycle. These side effects are generally mild and temporary. However, if you experience severe symptoms or if your period is more than a week late after taking the ECP, it is advisable to take a pregnancy test or consult with a healthcare provider for further evaluation.

It's also important to note that while emergency contraception is effective, it is not intended to be used as a regular form of birth control. If you find yourself needing emergency contraception frequently, it may be beneficial to discuss long-term contraceptive options with your healthcare provider.

In summary, taking the emergency contraceptive pill shortly after the incident is a proactive step to prevent unintended pregnancy. The side effects you are experiencing are common and should resolve on their own. If you have any concerns about your symptoms or the effectiveness of the ECP, do not hesitate to reach out to a healthcare professional for personalized advice and support.

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


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