Concerns After Taking Emergency Contraceptive: What You Need to Know - Obstetrics and Gynecology

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Doctor, I had intercourse on the afternoon of the 12th, and my boyfriend ejaculated.
I took emergency contraception (Plan B) on the evening of the 13th.
Today is the 18th, and I haven't experienced any physiological reactions.
Does this mean the medication was ineffective? Today, my boyfriend accidentally broke the condom, and there was semen left inside.
Should I buy another dose of emergency contraception, or is it unnecessary?

Niming, 10~19 year old female. Ask Date: 2008/08/18

Dr. Huang Jianxun reply Obstetrics and Gynecology


All methods of avoidance are not 100% guaranteed.
Please take a pregnancy test if your period does not arrive as expected next time.
Emergency contraception should not be taken lightly, as it can have side effects.
Consider whether you have already passed the fertile window.

Reply Date: 2008/08/18

More Info


When it comes to concerns after taking emergency contraceptive pills (ECPs), such as Plan B (Levonorgestrel) or Ella (Ulipristal Acetate), it’s important to understand how these medications work and what to expect afterward.
Emergency contraceptive pills are designed to prevent pregnancy after unprotected intercourse or contraceptive failure, such as a broken condom. They are most effective when taken as soon as possible after the incident, ideally within 72 hours for Levonorgestrel and up to 120 hours for Ulipristal Acetate. However, they do not terminate an existing pregnancy; they work primarily by delaying ovulation.

In your case, since you took the emergency contraceptive on the 13th after having unprotected sex on the 12th, you acted within the recommended time frame. The absence of immediate physical symptoms does not necessarily indicate that the medication was ineffective. Many women do not experience noticeable side effects after taking ECPs, and the effectiveness of the pill is not contingent on experiencing symptoms.

Regarding your concern about the second incident on the 18th, where the condom broke, it is advisable to take another dose of emergency contraception. Since the first dose was taken a few days prior, and given that you had unprotected intercourse again, taking another ECP is a prudent choice. The effectiveness of ECPs diminishes the longer you wait after unprotected intercourse, so taking it as soon as possible is crucial.

It’s also important to note that while ECPs are safe for most women, they can cause side effects such as nausea, fatigue, headache, dizziness, and changes in your menstrual cycle. Some women may experience their next period earlier or later than expected, and it may be lighter or heavier than usual. If your period is more than a week late after taking the ECP, it’s advisable to take a pregnancy test to confirm whether or not you are pregnant.

In summary, here are the key points to consider:
1. Effectiveness of ECPs: The absence of immediate physical symptoms does not mean the ECP was ineffective. Many women do not experience side effects.


2. Second Dose: Given the second incident of unprotected sex due to a broken condom, you should take another dose of emergency contraception as soon as possible.

3. Monitoring Your Cycle: Keep track of your menstrual cycle after taking the ECP. If your period is significantly delayed, consider taking a pregnancy test.

4. Consult a Healthcare Provider: If you have ongoing concerns about your reproductive health or the use of emergency contraception, it’s always a good idea to consult with a healthcare provider. They can provide personalized advice and support based on your individual health needs.

5. Understanding Your Options: If you find yourself needing emergency contraception frequently, it may be worth discussing long-term contraceptive options with your healthcare provider to find a method that suits your lifestyle and needs better.

Taking proactive steps and being informed about your reproductive health can help alleviate anxiety and ensure that you make the best decisions for your body.

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