Ovulation Signs and Pregnancy Chances After Emergency Contraception - Obstetrics and Gynecology

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Hello, doctor...
My last menstrual period was from August 15 to August 21.
I had sexual intercourse on August 24, and on the morning of August 26, I took the emergency contraceptive pill prescribed by my obstetrician, which was a three-day regimen with three doses per day.
On September 4 and 5, I experienced pain in my lower right abdomen and noticed brown discharge.
Could this be a sign of ovulation? Additionally, my menstrual cycle has not been regular; over the past six months, it has been longer than 28 days, with some cycles taking as long as 50 days.
Is there still a possibility of pregnancy? What is the likelihood? Thank you for taking the time to respond!

worry..., 20~29 year old female. Ask Date: 2002/09/08

Dr. Xu Junzheng reply Obstetrics and Gynecology


Emergency contraceptive pills are likely to cause irregularities in subsequent menstrual cycles.
Whether irregular menstruation affects the chances of conception should be evaluated by a physician, as irregular periods do not necessarily mean that conception is difficult.
Thank you!

Reply Date: 2002/09/08

More Info


Understanding ovulation signs and the chances of pregnancy after taking emergency contraception is crucial for anyone who is sexually active. In your case, you had your last menstrual period from August 15 to August 21, and you had unprotected intercourse on August 24. You took emergency contraception on August 26, which is within the recommended time frame to prevent pregnancy after unprotected sex.

Emergency contraception pills (ECPs) are most effective when taken as soon as possible after unprotected intercourse. They work primarily by delaying ovulation, which means that if you take them before ovulation occurs, they can effectively prevent the release of an egg. If ovulation has already occurred, ECPs may not be effective in preventing pregnancy.

Regarding your symptoms of right lower abdominal pain and the presence of brown discharge on September 4 and 5, these could be signs of several things. Brown discharge often indicates old blood, which can occur during the menstrual cycle, particularly at the beginning or end of a period. It can also be a sign of ovulation, especially if it occurs around the time you would expect to ovulate. However, given your irregular menstrual cycles, it is challenging to pinpoint exactly when ovulation occurs.

Your menstrual cycle has been irregular, with cycles lasting longer than 28 days and even extending to 50 days. This irregularity can make it more difficult to predict ovulation and, consequently, your chances of becoming pregnant. If your cycle is longer than usual, ovulation may occur later than expected, which could affect the timing of when you might conceive.

As for the likelihood of pregnancy after taking emergency contraception, studies suggest that ECPs can reduce the risk of pregnancy by up to 89% when taken within 72 hours after unprotected intercourse. However, their effectiveness decreases the longer you wait to take them after the unprotected sex. Since you took the ECP within two days, you have significantly reduced your chances of becoming pregnant.

To summarize, while there is still a possibility of pregnancy, especially given your irregular cycles, the chances are considerably lower due to the timely administration of emergency contraception. If you continue to experience symptoms or if your next period is significantly delayed, it would be advisable to take a pregnancy test or consult with a healthcare provider for further evaluation.

In addition, if you find that your menstrual cycles remain irregular or if you have concerns about your reproductive health, it may be beneficial to consult with a healthcare provider. They can help assess your menstrual cycle, discuss potential underlying issues, and provide guidance on family planning and contraception options that may be more suitable for your situation. Regular monitoring and open communication with your healthcare provider can help you better understand your body and reproductive health.

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