Your Fertility: When Did You Conceive? - Obstetrics and Gynecology

Pregnancy probability

Hello, doctor.
I would like to inquire about my last menstrual period, which started on the evening of November 4, 2023.
My menstrual cycles are regular, approximately 28-30 days, and last about 6 days.
I had sexual intercourse on November 7 (early morning of November 8) while my period was still ongoing, and again on the morning of November 13.
On November 15, I used an ovulation test, which showed a positive result, and by November 17, the test showed a negative result.
I took a pregnancy test on November 26 and saw a faint second line.
I would like to know which day I am more likely to have conceived successfully.

Yu, 20~29 year old female. Ask Date: 2024/02/14

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, your gestational age may not be accurately determined from your last menstrual period.
Please visit an obstetrician for an examination.
Wishing you good health.

Reply Date: 2024/02/14

More Info

To determine when you might have conceived, we need to analyze your menstrual cycle and the timing of your ovulation and sexual intercourse. Based on the information you provided, your last menstrual period (LMP) started on November 4, 2023, and you typically have a cycle length of 28 to 30 days. This means your next expected period would be around December 2 to December 4, 2023.

You mentioned that your period lasts about six days, which means it likely ended around November 10. You had sexual intercourse on November 7 (while still menstruating) and again on November 13. You used an ovulation test on November 15, which showed a positive result, indicating that you were likely about to ovulate. The ovulation test turned negative on November 17, suggesting that ovulation occurred sometime between November 15 and November 17.

Sperm can live inside the female reproductive tract for up to five days, so if you had intercourse on November 7 and November 13, there is a possibility that sperm from those encounters could still be viable when you ovulated around November 15 to November 17. However, since the ovulation test was positive on November 15, it is most likely that you conceived from the intercourse that occurred on November 13, as this timing aligns closely with your ovulation.

Regarding the faint line you observed on your pregnancy test on November 26, it is common for early pregnancy tests to show a faint line if the hormone hCG (human chorionic gonadotropin) is still building up in your system. The level of hCG doubles approximately every 48 hours in early pregnancy, so if you take another test a few days later, you may see a darker line if you are indeed pregnant.

In summary, the most likely date of conception is around November 15 to November 17, given your ovulation timing. The sexual intercourse on November 13 is the most probable contributor to conception, as it coincides closely with your ovulation window.
If you have further concerns about your pregnancy or fertility, consider consulting with a healthcare provider for personalized advice and potential follow-up testing. They can provide guidance on what to expect in early pregnancy and help monitor your hCG levels if necessary.

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