Pregnancy Testing After Emergency Contraceptive Use

The issue of pregnancy testing after taking emergency contraceptive pills?

Hello Doctor, I am the questioner of #157310.
My menstrual cycle is approximately 26-28 days.
The first day of my period this month was May 27.
On June 12, I had unprotected intercourse for about one minute, but there was no ejaculation.
The next morning, I took the Ella emergency contraceptive pill (within about 12 hours).
According to my app, today should be the first day of my period.
This morning, I took a pregnancy test, which showed negative, but my period has not arrived yet, and I still have premenstrual symptoms (lower abdominal pain, backache, etc.).
I would like to ask the doctor if the pregnancy test result is accurate since June 12 was the day of intercourse, and today, June 23, is the 12th day after the sexual activity.
If my period continues to be absent, how long should I wait before seeing a gynecologist?

Niming, 20~29 year old female. Ask Date: 2020/06/23

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, the chances of pregnancy should be low; just keep monitoring.
Wishing you good health.

Reply Date: 2020/06/23

More Info

When it comes to understanding pregnancy testing after the use of emergency contraception, it's essential to consider several factors, including the timing of the test, the nature of the contraceptive used, and the menstrual cycle.

In your case, you had unprotected intercourse on June 12 and took Ella (an emergency contraceptive pill) within approximately 12 hours. Ella is effective in preventing pregnancy when taken as directed, especially if taken within 72 hours after unprotected intercourse. However, its effectiveness can be influenced by where you are in your menstrual cycle.
You mentioned that your menstrual cycle typically ranges from 26 to 28 days, with your last period starting on May 27. Based on this cycle, your next expected period would be around June 22 to June 25. Since you tested for pregnancy on June 23 and received a negative result, it is still within the window of time where your period could arrive, especially since emergency contraception can cause temporary changes in your menstrual cycle.
The negative pregnancy test at this point is likely accurate, as it is generally recommended to wait at least one week after a missed period for the most reliable results. However, since you are experiencing premenstrual symptoms such as abdominal pain and lower back pain, it is possible that your period may still arrive shortly. Emergency contraceptives can sometimes delay ovulation or alter the timing of your menstrual cycle, leading to a late period.

If your period does not arrive within a week or so after the expected date, it would be advisable to take another pregnancy test. If the second test is also negative and your period still does not come, it would be prudent to consult with a healthcare provider. They can perform a more sensitive blood test for pregnancy and evaluate any underlying issues that may be affecting your menstrual cycle.

In summary, while your current negative pregnancy test is likely accurate, the timing of your test and the effects of the emergency contraceptive on your cycle should be taken into account. If your period does not arrive soon, follow up with a healthcare provider for further evaluation. It’s always better to err on the side of caution when it comes to reproductive health.

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Hello, you should not be pregnant. Wishing you good health.

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

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