Your Pregnancy Timeline: When Did Conception Likely Occur?

Pregnancy cycle

Your last menstrual period started on March 24 and ended on March 31.
Today is June 21, and you are currently 12 weeks and 2 days pregnant.
Based on this information, ovulation and the most likely time for conception would have occurred approximately 2 weeks after the start of your last menstrual period, which would be around April 7.
Therefore, the likely date of conception would be around April 7 to April 14.

Yi Chen, 20~29 year old female. Ask Date: 2016/06/21

Dr. Lü Lizheng reply Obstetrics and Gynecology

First, please ensure that your estimated gestational age is accurate in order to calculate the conception date correctly.
Otherwise, if the gestational age is estimated incorrectly, the conception date will also be estimated incorrectly.
The conception typically occurs around 2 weeks into the pregnancy, so counting back 10 weeks and 2 days from June 21 would give you the estimated conception date.
Sincerely, Dr.
Lu Li-Cheng, Taoyuan Hospital.

Reply Date: 2016/06/21

More Info

To determine when conception likely occurred, we need to consider the typical menstrual cycle and the timing of ovulation. In a standard 28-day cycle, ovulation usually occurs around 14 days after the first day of the last menstrual period (LMP). However, cycles can vary in length, and ovulation can occur earlier or later depending on individual factors.

Given your information, your last menstrual period (LMP) started on March 24. If we assume a typical 28-day cycle, ovulation would likely have occurred around April 7. Sperm can survive in the female reproductive tract for up to five days, so if you had intercourse in the days leading up to ovulation, it is possible for conception to occur shortly after. Therefore, if you had sexual intercourse around April 5 to April 9, this would align with the timing of ovulation and the potential for conception.

Now, considering that you are currently 12 weeks and 2 days pregnant as of June 21, this places your estimated due date around December 26, based on a typical 40-week pregnancy. The gestational age is calculated from the first day of your last menstrual period, which means that your estimated conception date would be around April 7, give or take a few days.

It's important to note that while these calculations provide a general guideline, individual variations in cycle length, ovulation timing, and sperm survival can affect the exact timing of conception. If there are any uncertainties regarding the paternity of the child, genetic testing can provide definitive answers, but this is a personal decision that should be made with careful consideration.

In summary, based on your menstrual cycle and the timing of your pregnancy, conception likely occurred around April 7. If you have any further questions or concerns about your pregnancy, it is always best to consult with your healthcare provider for personalized advice and support. They can provide you with more detailed information based on your medical history and any specific circumstances you may have.

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