What is the probability of becoming pregnant?
The last menstrual period started on March 25, and it typically comes a few days early each month, making it difficult to calculate the ovulation period.
However, it is estimated that ovulation occurred around April 7-8.
Intercourse took place on April 6, which is considered a high-risk period.
A condom was initially used but accidentally slipped off, resulting in ejaculation inside.
The morning after pill (Plan B) was taken half an hour later.
However, information online suggests that the risk of pregnancy is high during the fertile window.
Therefore, I would like to ask the doctor if the chances of pregnancy in this situation are high?
Wenwen, 20~29 year old female. Ask Date: 2021/04/08
Dr. Lin Manying reply Obstetrics and Gynecology
Ms.
Wenwen: Hello, based on your description, it is unpredictable.
If your period is delayed, please take a pregnancy test.
Hualien Hospital, Ministry of Health and Welfare, cares about your health.
Reply Date: 2021/04/08
More Info
When considering the chances of pregnancy after unprotected intercourse during the ovulation period, several factors come into play. Based on your menstrual cycle, if your last period started on March 25 and you estimate your ovulation to be around April 7-8, then having intercourse on April 6 places you very close to your fertile window. The fertile window typically spans from about five days before ovulation to one day after, as sperm can survive in the female reproductive tract for up to five days.
Given that you had unprotected intercourse during this time, the likelihood of pregnancy is indeed higher. The fact that the condom slipped off and you had internal ejaculation increases the risk further. However, you took emergency contraception (Plan B, or Anlitin in your case) within half an hour of the incident, which is a critical step in reducing the chances of pregnancy. Emergency contraceptive pills are most effective when taken as soon as possible after unprotected intercourse, ideally within 72 hours, but they can still be effective up to five days later, albeit with decreasing efficacy.
The effectiveness of emergency contraception can vary based on several factors, including where you are in your menstrual cycle when you take it. If you are close to ovulation, the chances of the emergency contraceptive being effective can be lower, but it is still a viable option. Studies suggest that emergency contraceptive pills can reduce the risk of pregnancy by 75-89% when taken within the recommended time frame.
It is also important to consider that while emergency contraception is effective, it is not 100% guaranteed to prevent pregnancy. If you miss your next period or experience any unusual symptoms, it would be wise to take a pregnancy test or consult with a healthcare provider for further evaluation.
In summary, while the timing of your intercourse during your estimated ovulation period does increase the risk of pregnancy, taking emergency contraception shortly after the incident significantly reduces that risk. If you have any concerns or experience any symptoms, follow up with your healthcare provider for personalized advice and support.
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