Pregnancy Chances After Emergency Contraception Use

What is the likelihood of getting pregnant?

Hello, doctor.
I have a question.
I took the emergency contraceptive pill on September 29, and I experienced bleeding from October 6 to October 7, which I thought was my period.
Therefore, I took the regular contraceptive pill (21-pack) on October 7.
I'm unsure if this has been effective for contraception.
If there is a possibility of pregnancy, when should I take a pregnancy test?

Miss Lin, 20~29 year old female. Ask Date: 2016/10/25

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, you can start taking birth control pills on the fifth day of your menstrual cycle.
It doesn't have to be at the exact same time; a general timeframe is sufficient.
As long as you take them consistently, they will be effective for contraception.
Generally, you should wait at least 12 days after conception to take a pregnancy test for accurate results.
Wishing you good health!

Reply Date: 2016/10/25

More Info

When it comes to understanding the chances of pregnancy after using emergency contraception, it's important to consider several factors, including the timing of ovulation, the effectiveness of the emergency contraceptive pill (ECP), and the subsequent use of regular contraceptive methods.

Emergency contraceptive pills, such as Plan B (levonorgestrel), 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 can be taken up to 5 days after. The effectiveness of ECPs decreases the longer you wait to take them after unprotected sex. If taken correctly, they can reduce the risk of pregnancy by up to 89%.

In your case, you took the emergency contraceptive pill on September 29. The bleeding you experienced on October 6-7 could be a side effect of the ECP, often referred to as withdrawal bleeding, which can occur due to hormonal changes. This bleeding does not necessarily indicate that your menstrual cycle has resumed or that you are not pregnant.

After taking an emergency contraceptive, it is advisable to wait at least 1-2 weeks after the expected date of your next period to take a pregnancy test. This is because it takes time for the hormone levels to rise in the event of pregnancy, and testing too early may result in a false negative. If your period is delayed by more than a week, it is recommended to take a home pregnancy test or consult with a healthcare provider for a blood test.

Regarding the use of regular contraceptives after taking emergency contraception, it is important to note that ECPs do not provide ongoing protection against pregnancy. If you started taking a regular contraceptive pill on October 7, you should follow the instructions provided with that medication. Typically, it takes about 7 days for the pill to become effective, so using a backup method, such as condoms, during that time is advisable.

In summary, your chances of pregnancy after taking emergency contraception depend on several factors, including the timing of your menstrual cycle, the timing of the ECP, and the use of regular contraceptives afterward. If you have any concerns or if your period does not arrive as expected, it is best to take a pregnancy test and consult with your healthcare provider for further guidance.

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