Conception Dates: Can February 9 Be the Day?

Fertility issues

Hello Doctor, my last menstrual period was on February 4 (with a menstrual cycle of 31 days).
I had an ultrasound on March 30 at 7 weeks and 1 day, and my due date is November 11, with the gestational age at 13 weeks and 5 days.
I had protected intercourse with ejaculation outside on February 9, and unprotected intercourse on February 10 and February 16.
Could the date of conception possibly be February 9? Thank you.

yu, 30~39 year old female. Ask Date: 2022/12/05

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, the dates of February 9th and February 10th are too close together to determine clearly.
However, since you used a condom on February 9th, the likelihood of any issue should be low.
Wishing you good health.

Reply Date: 2022/12/05

More Info

To determine the possible conception date, it is essential to understand the menstrual cycle and the timing of ovulation. In a typical 31-day cycle, ovulation usually occurs around 14 days before the start of the next menstrual period. Therefore, if your last menstrual period started on February 4, you would likely ovulate around February 18.
However, sperm can survive in the female reproductive tract for up to five days, which means that intercourse occurring a few days before ovulation can still result in conception. In your case, you mentioned having sexual intercourse on February 9 with a condom used for external ejaculation, and then again on February 10 and February 16 without a condom.
Given this information, let's analyze the likelihood of conception on February 9. Since ovulation is expected around February 18, having sexual intercourse on February 9 could potentially lead to conception, especially if ovulation occurs later than expected. However, the use of a condom for external ejaculation on February 9 significantly reduces the likelihood of sperm reaching the egg, as the condom acts as a barrier.

The sexual encounters on February 10 and February 16 are also relevant. Since February 10 is just a day after your encounter on February 9, it is still within the window where sperm from the previous encounter could be viable. The encounter on February 16 is closer to the expected ovulation date, making it a more likely candidate for conception if ovulation occurs around February 18.

To summarize, while February 9 could be a potential conception date, the likelihood is diminished due to the use of a condom. The encounters on February 10 and February 16 are more significant in terms of potential conception, especially if ovulation occurs as expected around February 18.
If you are trying to determine the exact conception date, it is important to consider that the timing of ovulation can vary from cycle to cycle, and factors such as stress, illness, and hormonal fluctuations can influence this timing. If you are uncertain about your ovulation or conception dates, it may be beneficial to consult with a healthcare provider who can offer personalized advice and possibly conduct tests to confirm pregnancy and estimate gestational age.

In conclusion, while February 9 is a possibility, the encounters on February 10 and February 16 may hold a higher likelihood of resulting in conception, especially considering the timing of ovulation in a typical cycle. If you have further questions or concerns about your menstrual cycle or conception, I recommend reaching out to a healthcare professional for more tailored guidance.

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