Determining Your Conception Date: Insights for Expecting Mothers - Obstetrics and Gynecology

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What is the date of conception?


Based on your information, if you had intercourse on October 6, October 14, and October 31, and you tested positive for pregnancy at 5 weeks and 3 days, it is more likely that conception occurred around October 14.
This aligns with an estimated due date of June 30.

Ch, 20~29 year old female. Ask Date: 2022/04/17

Dr. Huang Yuande reply Obstetrics and Gynecology


If the menstrual cycle is 28 days, the chances are higher on October 6th.

Reply Date: 2022/04/17

More Info


Determining the conception date can be a crucial aspect for expecting mothers as it helps in estimating the due date and understanding the pregnancy timeline. Based on the information you've provided, you had sexual intercourse on October 6 and October 14, and your pregnancy test indicated that you were approximately 5 weeks and 3 days pregnant on October 31. Your estimated due date is June 30.

To calculate the likely conception date, we need to consider the average ovulation cycle. Typically, ovulation occurs about 14 days before the start of your next menstrual period. If we assume that you have a regular menstrual cycle of around 28 days, ovulation would likely occur around day 14 of your cycle. If we take October 31 as the date of your positive pregnancy test, which indicates you are 5 weeks and 3 days pregnant, we can backtrack to estimate your conception date.

Five weeks and three days from October 31 would place the conception date around October 1. This suggests that the sexual intercourse on October 6 and October 14 may not have resulted in conception, as the timing is a bit late for those dates. However, sperm can live inside the female reproductive tract for up to five days, which means that if you ovulated shortly after October 6, it is possible that intercourse on that date could have led to conception.

Given your estimated due date of June 30, this aligns more closely with a conception date around early October. Therefore, while the October 6 encounter could potentially be the date of conception, it is more likely that the conception occurred closer to the time of ovulation, which would be around the beginning of October.

It's important to note that every woman's cycle can vary, and factors such as cycle length, ovulation timing, and sperm viability can all influence the conception date. If you have irregular cycles or other concerns, it may be beneficial to consult with a healthcare provider for personalized insights.

In summary, based on the information provided, the most likely conception date would be around early October, possibly influenced by the sexual encounter on October 6. However, the exact date can vary based on individual factors, and it is always best to consult with a healthcare professional for a more accurate assessment.

Similar Q&A

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To estimate the date of conception, we can consider the details provided. Your last menstrual period (LMP) started on February 10. Typically, ovulation occurs about 14 days after the start of the last menstrual period, which would be around February 24. You mentioned having sex...


Dr. Huang Yuande reply Obstetrics and Gynecology
The gestational age shown by ultrasound is usually more accurate, so you can count back six weeks from May 7, which may indicate the date of conception.

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If the due date is October 23, the estimated conception date would be around January 16. Since you took a pregnancy test on February 6 and only saw one line, it could indicate a negative result. However, when you tested again on February 14 and the second line appeared slowly wit...


Dr. Zhang Kunmin reply Obstetrics and Gynecology
Hello, the date of conception is usually estimated accurately through ultrasound at around 8 to 9 weeks of pregnancy. Based on your description, it is difficult to make an accurate calculation and explanation. Thank you! Wishing you peace and health, Dr. Zhang.

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Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, your due date is June 5th, which means conception likely occurred around September 12th. Wishing you good health!

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Hello, doctor: I have a question. I previously had prenatal check-ups at three different clinics, which estimated my due date to be January 5 and January 9. However, I gave birth to a 3,000-gram baby girl on December 31. Although it was a full-term delivery, I would like to know ...


Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, I apologize for not being able to accurately determine the date of conception based on your description. It could be April 15, but it may also be at another time. If you still have concerns, I recommend consulting your original obstetrician. Wishing you good health.

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