Determining Conception Dates: Key Insights for Expecting Mothers

Date of conception

Hello, Doctor.
I apologize for bothering you.
I previously asked you about the possible days of conception.
My original question was as follows: [Hello, Doctor.
June 27 was the first day of my menstrual period, and it ended on July 1.
I visited the hospital on August 4, and the gestational age was 5 weeks and 2 days.
I had sexual intercourse on July 3, July 10, and July 13.
Could you please tell me which day of intercourse is more likely to have resulted in pregnancy? Thank you for your assistance.
Additional information: Today, August 28, my gestational age is 8 weeks and 5 days.] Doctor, you mentioned that July 10 and July 13 are both possible dates for conception.
Does that mean that July 3 is not a possible date?

Xiao Qi, 20~29 year old female. Ask Date: 2022/08/28

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, in medicine, there are no absolutes, only varying probabilities.
A 7/3 chance is low.
You may also consult your obstetrician.
Wishing you good health.

Reply Date: 2022/08/28

More Info

To determine the conception date for expecting mothers, it is essential to understand the menstrual cycle and the timing of ovulation. Based on the information provided, your last menstrual period (LMP) started on June 27, and your cycle appears to be relatively regular. The typical menstrual cycle lasts about 28 days, but it can vary from woman to woman.

Ovulation usually occurs approximately 14 days after the first day of your last menstrual period. In your case, if we consider June 27 as the first day of your cycle, ovulation would likely have occurred around July 11. This is the time when you are most fertile, and conception is most likely to occur if you engage in sexual intercourse during this window.

You mentioned having sexual intercourse on July 3, July 10, and July 13. Based on the ovulation date, the most probable days for conception would be July 10 and July 13, as these dates are closer to the ovulation window. While sperm can survive in the female reproductive tract for up to five days, the chances of conception from intercourse on July 3 are significantly lower since it is further away from the ovulation date.

Given that you are currently at 8 weeks and 5 days pregnant as of August 28, this aligns with the conception likely occurring around July 10 or July 13. The gestational age is typically calculated from the first day of your last menstrual period, which explains why you are at 8 weeks and 5 days now.

In summary, while there is a possibility of conception from intercourse on July 3, it is much less likely compared to the encounters on July 10 and July 13. If you are trying to pinpoint the exact date of conception for any reason—such as determining paternity or understanding your pregnancy timeline—focusing on the dates closer to ovulation will provide a more accurate estimate.

It is also important to note that while tracking ovulation can help in understanding conception dates, individual cycles can vary, and factors such as stress, illness, or hormonal changes can affect ovulation timing. If you have further questions or concerns regarding your pregnancy, it is always best to consult with your healthcare provider for personalized advice and guidance.

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