Hello everyone, I believe there are still many friends who don’t know much about how to calculate the due date and the calculation method of the due date. It doesn’t matter, I will explain it to you today. Share the issue of how to calculate the due date and the calculation method of the due date. The article may be too long. I hope it can help everyone. Let’s take a look below!
Contents of this article
- Estimated delivery date calculator formula
- How to calculate the due date if you know the date of intercourse
- When does the due date start to be calculated
- The formula for calculating the expected date of delivery
- The calculation method for the expected date of delivery
- What is due date
1. Due date calculator Formula
There is a formula for calculating a woman\’s due date. It can generally be calculated based on a woman\’s last menstrual period. For example, you can add 9 to the month of the last menstrual period. Or subtract 3, and then add 7 to the number of days to get your expected delivery date. For example, if your last menstrual period is January 1st, your expected delivery date is October 8th. It can also be calculated based on B-ultrasound.
2. How to calculate the expected date of delivery if you know the date of intercourse
Women are pregnant The time and expected date of delivery are generally calculated from the first day of the last menstrual period. Add nine or subtract three to the month of the last menstrual period, and add seven to the date, which is the expected date of delivery
3. When does the expected date of delivery start?
1. Generally speaking, it takes 280 days to get pregnant, and four days to get pregnant. At ten weeks, the expected date of delivery is calculated from the first day of a person\’s last menstrual period, add nine or subtract three to the month, and add seven to the day. If the expectant mother adds fifteen, it is the expected date of delivery according to the lunar calendar. Calculation of due date is only a rough estimate. Depending on the actual situation of the mother, the difference may be about seven days.
2. If menstruation is normal and the cycle is short, less than one month, the day of labor is probably before the expected date of delivery;If the menstrual cycle is usually long, about forty days, the day of labor is usually after the expected date of delivery.
4. Calculation formula of expected delivery date
1. If the last menstrual period is clear , the first day of the last menstrual period in the Gregorian calendar is used as the base, the month is subtracted by 3 or added by 9, and the number of days is added by 7. Those who are qualified should check the expected date of delivery based on the early pregnancy ultrasound examination report;
2. If the last menstrual period is unclear or the pregnancy occurs without menstruation during lactation, ultrasound examination can be used to help estimate the expected date of delivery. At the same time, if the time interval between the gestational age calculated based on the last menstrual period and the gestational age detected by ultrasound is more than 5 days, the expected date of delivery will be corrected based on the early ultrasound examination;
3. Assistance For those conceived through reproductive technology, such as in vitro fertilization, the last menstrual period should be calculated forward 18 days from the embryo transfer date to calculate the expected date of delivery.
5. Calculation method of due date
The calculation method of due date is It is calculated based on the last menstrual period. Add 9 to the month of the last menstrual period or subtract 3 to get the number of months before the due date. Add 7 to the day of the last menstrual period to get the number of days before the due date. The period from the first day of the last menstrual period to delivery is generally 280 days. Clinically, gestational weeks are used to express pregnancy. Each week is seven days, and the total pregnancy is 40 weeks.
6. What is the expected date of delivery
1. The expected date of delivery refers to the fetus It matures in the body of a pregnant woman and is about to be born on the day. The expected date of delivery generally refers to 40 weeks of pregnancy. The expected date of delivery is calculated based on the last menstrual period of the pregnant woman. The expected date of delivery is not the exact time of delivery. Only about 5% of women give birth on the expected date of delivery.
2. Because everyone may ovulate early or late, it is difficult for pregnant women to accurately judge the specific time of conception. As long as the fetus is born half a month early or half a month behind the expected date, it is normal.
This ends the content on how to calculate the due date. I hope it will be helpful to everyone.
