When Did I Conceive? Your Pregnancy Timeline

When to get pregnant?

Last month, my menstrual period was from September 14 to September 18.
After my period ended on the 19th, I forgot which day I had intercourse, but there was ejaculation.
On October 26, I discovered that my period had not arrived, so I went to see an obstetrician, who told me that I was 4-6 weeks pregnant.
I would like to know approximately when I conceived.

Xiao Mei, 20~29 year old female. Ask Date: 2016/10/30

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, I apologize that it is not possible to determine the exact time of pregnancy based on a diagnosis of 4-6 weeks of gestation.
If you have further questions, please consult your original obstetrician.
Wishing you good health.

Reply Date: 2016/10/30

More Info

To determine when you likely conceived, we need to consider the timing of your menstrual cycle and the ovulation process. Based on your last menstrual period (LMP) from September 14 to September 18, and assuming you have a typical cycle length of about 28 days, ovulation would typically occur around 14 days after the first day of your last period. This means ovulation would likely have occurred around September 28.

Sperm can survive in the female reproductive tract for up to five days, so if you had intercourse shortly after your period, particularly around the time of ovulation, it is possible that conception occurred within a few days of that date. If you had unprotected intercourse around September 28 or shortly thereafter, that would be the most likely window for conception.

When you visited your healthcare provider on October 26 and were told you were approximately 4-6 weeks pregnant, this aligns with the expected timeline. Pregnancy is typically calculated from the first day of your last menstrual period, which means that by October 26, you would be about 4-6 weeks pregnant, depending on the exact timing of ovulation and conception.

To summarize, if your last menstrual period started on September 14 and you ovulated around September 28, conception likely occurred between September 28 and October 3. This is a common way to estimate the conception date based on the menstrual cycle.

In terms of pregnancy dating, healthcare providers often use the LMP as a reference point because it is a more consistent and easily identifiable date for most women compared to the exact date of conception, which can be harder to pinpoint. This method assumes a regular cycle and can vary based on individual circumstances.

If you have any further questions or concerns about your pregnancy timeline or health, it is always best to consult with your healthcare provider. They can provide personalized advice and support based on your specific situation.

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