Pregnancy Chances: Can You Conceive from Intercourse? - Obstetrics and Gynecology

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Probability of Pregnancy


I had my period on May 9, 2018, which lasted about 3 to 4 days.
After having sexual intercourse with withdrawal on May 16, I found out I was pregnant in June.
An ultrasound on July 2 showed a gestational age of 6 weeks and 6 days, with a due date of February 16.
I would like to know if the pregnancy is likely from the intercourse on May 16.

Lele, 20~29 year old female. Ask Date: 2019/01/24

Dr. Huang Jianzhong reply Obstetrics and Gynecology


(Menstrual irregularity) Menstruation started on May 9, 2018, lasting about 3 to 4 days.
After having intercourse with withdrawal on May 16, I found out I was pregnant in June.
An ultrasound on July 2 showed a gestational age of 6 weeks and 6 days, with a due date of February 16.
I would like to know if the pregnancy is from the intercourse on May 16.
Answer: It is likely that the pregnancy did not occur from the intercourse on May 16.

Reply Date: 2019/01/24

More Info


Understanding the chances of conception from intercourse, especially in the context of irregular menstrual cycles, can be complex. Based on the details you provided, it seems that you had your last menstrual period on May 9, 2018, and engaged in intercourse on May 16, where you mentioned that there was external ejaculation followed by internal ejaculation. You confirmed your pregnancy on June 2, and an ultrasound showed an embryo at 6 weeks and 6 days, with a due date of February 16.

To determine if the intercourse on May 16 could have resulted in your pregnancy, we need to consider a few key factors:
1. Ovulation Timing: In a typical 28-day menstrual cycle, ovulation usually occurs around day 14. However, since you mentioned that your menstrual cycles are irregular, pinpointing the exact day of ovulation can be challenging. Irregular cycles can lead to variations in ovulation timing, which can occur anywhere from a few days before to a few days after the expected ovulation day.

2. Sperm Viability: Sperm can survive in the female reproductive tract for up to five days. This means that if you ovulated shortly after May 16, there is a possibility that the sperm from that intercourse could have fertilized an egg.

3. Conception Window: The fertile window typically spans about six days leading up to ovulation and the day of ovulation itself. If you had intercourse on May 16 and ovulated shortly thereafter, it is plausible that this encounter could have led to conception.

4. Pregnancy Confirmation: The ultrasound at 6 weeks and 6 days indicates that the embryo is developing, and the estimated due date aligns with a conception that could have occurred around mid-May.
Given these factors, it is indeed possible that the intercourse on May 16 resulted in your pregnancy, especially if you ovulated shortly after that date. However, without precise tracking of your ovulation, it is difficult to confirm this definitively.


Additional Considerations:
- Tracking Ovulation: For future reference, if you are trying to conceive or want to understand your cycle better, consider tracking ovulation using methods such as ovulation predictor kits, basal body temperature charting, or monitoring cervical mucus changes. These methods can help you identify your fertile window more accurately.

- Consulting a Healthcare Provider: If you have concerns about your menstrual cycle or fertility, it may be beneficial to consult with a healthcare provider. They can offer personalized advice and may suggest further evaluation if necessary.

- Understanding Irregular Cycles: Irregular menstrual cycles can be caused by various factors, including hormonal imbalances, stress, and lifestyle factors. Understanding the underlying cause of your irregular cycles can help in managing them and improving your chances of conception.

In conclusion, while it is likely that the intercourse on May 16 could have led to your pregnancy, the irregularity of your cycles makes it difficult to pinpoint the exact date of conception. If you have further questions or concerns, do not hesitate to reach out to your healthcare provider for more tailored advice. Congratulations on your pregnancy, and best wishes for a healthy journey ahead!

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