What is the due date?
Hello doctor, my girlfriend's last menstrual period was on May 1st, with a cycle length of 30-31 days.
We had intercourse on May 30th, and on June 11th, we detected a faint positive line on the pregnancy test.
Could you please tell me the estimated due date? Thank you.
JJ, 30~39 year old female. Ask Date: 2020/06/11
Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, it should be around March 4th next year.
Wishing you good health.
Reply Date: 2020/06/11
More Info
To estimate the due date based on the last menstrual period (LMP), we typically use a standard method known as Naegele's Rule. This rule states that you can calculate the estimated due date (EDD) by taking the first day of your last menstrual period, adding one year, subtracting three months, and then adding seven days.
In your case, your girlfriend's last menstrual period started on May 1st. Here’s how you can calculate the estimated due date:
1. Start with the first day of the last menstrual period: May 1.
2. Add one year: May 1, 2024.
3. Subtract three months: February 1, 2024.
4. Add seven days: February 8, 2024.
Therefore, the estimated due date based on the last menstrual period of May 1, 2023, would be February 8, 2024.
It's important to note that this method assumes a regular menstrual cycle of about 28 days. Since you mentioned that your girlfriend has a cycle of 30-31 days, this could slightly adjust the due date, but generally, the difference is minimal.
Regarding the conception date, since you mentioned that sexual intercourse occurred on May 30, and a pregnancy test was positive on June 11, it is likely that conception occurred shortly after the sexual encounter, around the time of ovulation, which typically occurs about 14 days after the start of the last menstrual period for a regular cycle.
In summary, while the estimated due date based on the last menstrual period is February 8, 2024, it is also important to have regular follow-ups with a healthcare provider for ultrasounds and other assessments, as they can provide a more accurate due date based on the development of the fetus.
Additionally, keep in mind that due dates are estimates and only about 5% of babies are born on their exact due date. Most will arrive within a week or two before or after the estimated date. Regular prenatal care is essential for monitoring the health of both the mother and the developing baby throughout the pregnancy.
Similar Q&A
How to Calculate Your Due Date: A Guide for Expecting Mothers
How to calculate the due date?
Dr. Wang Jionglang reply Obstetrics and Gynecology
For women with a regular menstrual cycle, the estimated due date is typically calculated as: month + 9, day + 7 (for example, if the last menstrual period was on January 1, the estimated due date would be October 8). If the menstrual cycle is irregular, an early ultrasound can be...[Read More] How to Calculate Your Due Date: A Guide for Expecting Mothers
Understanding Pregnancy Weeks: Calculating Due Dates from Last Menstrual Period
Hello, my last menstrual period was from January 14 to January 18, and I had unprotected intercourse on February 1. How should I calculate this? The doctor mentioned that the due date should be calculated from the last menstrual period for accuracy, and I'm a bit confused.
Dr. Cao Guotao reply Obstetrics and Gynecology
In medical terms, gestational weeks are calculated from the first day of the last menstrual period. Wishing you good health![Read More] Understanding Pregnancy Weeks: Calculating Due Dates from Last Menstrual Period
How to Calculate Your Conception Date from Last Menstrual Period?
If you know the date of your last menstrual period (LMP) and your due date, you can estimate the date of conception. Typically, conception occurs about two weeks after the first day of your last menstrual period. If you only know your due date and are unsure of your last menstr...
Dr. Lin Wenbin reply Obstetrics and Gynecology
If the menstrual cycle is not calibrated by a physician, it cannot be accurately determined. If the due date is calculated by a physician, then the ovulation date can be accurately estimated. Self-calculations may not be precise.[Read More] How to Calculate Your Conception Date from Last Menstrual Period?
Calculating Conception Date: Understanding Your Due Date and Ovulation
The current due date is November 4th, and I would like to know the exact conception date. Is it related to having intercourse on February 3rd? The last menstrual period was on January 25th.
Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, it can only be roughly estimated to be around mid-February. Wishing you good health.[Read More] Calculating Conception Date: Understanding Your Due Date and Ovulation
Related FAQ
(Obstetrics and Gynecology)
Menstruation(Obstetrics and Gynecology)
Pregnancy Date(Obstetrics and Gynecology)
Menstrual Period(Obstetrics and Gynecology)
Delayed Menstruation(Obstetrics and Gynecology)
First Menstruation(Obstetrics and Gynecology)
Menarche(Obstetrics and Gynecology)
Menstrual Abnormalities(Obstetrics and Gynecology)
Pms(Obstetrics and Gynecology)
Conception(Obstetrics and Gynecology)