Effectiveness of Emergency Contraceptive Pills After Unprotected Intercourse

Effectiveness of Birth Control Pills

Hello, doctor: I had unprotected intercourse on the morning of August 4th and realized it was during my fertile period, so I took the emergency contraceptive pill Ella that evening.
I had intercourse again from August 13th to August 15th, initially without a condom and then used one later.
Does the emergency contraceptive pill I took on August 4th still provide contraceptive protection?

Siang, 20~29 year old female. Ask Date: 2016/08/30

Dr. Lü Lizheng reply Obstetrics and Gynecology

Reply still has some effect.
Dr.
Lu Li-Cheng, Taoyuan Hospital.

Reply Date: 2016/08/30

More Info

Emergency contraceptive pills (ECPs), such as Ella (ulipristal acetate), are designed to prevent pregnancy after unprotected intercourse. They are most effective when taken as soon as possible after the incident, ideally within 72 hours, but can be taken up to 120 hours (5 days) after unprotected sex. The effectiveness of ECPs decreases the longer you wait to take them after the unprotected intercourse.

In your case, you mentioned having unprotected intercourse on August 4th and taking Ella that same evening. Since you took the emergency contraceptive pill within the recommended time frame, it should have been effective in preventing pregnancy from that specific encounter. However, it is important to note that ECPs do not provide ongoing protection against pregnancy for subsequent acts of unprotected intercourse.
You also mentioned having unprotected intercourse again between August 13th and August 15th. Since you did not take another dose of emergency contraception after these encounters, the effectiveness of the Ella you took on August 4th would not extend to these later instances. If you had unprotected intercourse during this time frame without using any form of contraception, there is a risk of pregnancy from those encounters.

To clarify further, emergency contraceptive pills work primarily by delaying ovulation. If ovulation has already occurred, the effectiveness of ECPs is significantly reduced. Therefore, if you had unprotected intercourse during your fertile window (which can vary depending on your menstrual cycle), there is a possibility that you could become pregnant from those later encounters.

If you are concerned about the possibility of pregnancy after the unprotected intercourse on August 13th and 15th, it may be advisable to take a home pregnancy test if your period is late or to consult with a healthcare provider for further guidance. Additionally, if you are sexually active and wish to avoid unintended pregnancies in the future, consider discussing regular contraceptive options with your healthcare provider.
In summary, the Ella you took on August 4th was effective for that encounter, but it does not provide protection for any subsequent unprotected intercourse. Always consider using a reliable form of contraception to prevent unintended pregnancies and consult with a healthcare professional for personalized advice and options.

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