The due date is calculated, and the master is 20

After pregnancy, you will have a baby around the due date. The expected date of delivery is calculated from the first day of the last menstrual period, minus 3 or 9 to the month, and 7 to the date. For example, the first day of the last menstrual period is January 1st, and the expected date of delivery is October 8th.

After the ultrasound is done at 11-13 weeks of pregnancy, the gestational age should be checked, and the gestational age should be estimated more accurately according to whether the mother's menstruation is regular, the first trimester of B-ultrasound, and the length of the head and hips at 11-13 weeks of pregnancy. For example, if the head and hip length of the b-ultrasound head at 11 weeks of pregnancy is 1 week smaller than the actual pregnancy week, the expected date of delivery will be delayed by 1 week. Since the embryos are generally developing synchronously until about 20 weeks, the gestational age can be checked based on ultrasound findings.

Your due date is December 19th, if you want to have a caesarean section and you can't get it yourself, you can let the doctor choose the best time for caesarean section according to the results of B ultrasound and the maturity of the placenta, generally after 38 weeks of pregnancy, it is a full-term baby, and it can be born, and the maturity of the placenta can wait until level 2 ++ before giving birth.

Generally, the due date is calculated by subtracting 3 months and adding 7 to the date, yours should be the due date on December 19th, my last menstrual period is December 14th, and the due date is September 21 according to the doctor's algorithm!

It is recommended that pregnant mothers adjust their mentality, and the expected date of delivery is just an approximate day, which is convenient for childbirth;

Generally, production is within 15 days before and after 15 days of the monthly delivery period;

You can find a software from the Internet to try. There are so many online!

The entire pregnancy period is 280 days, 10 months, 28 days a month, the last menstrual period is counted, and the due date should be December 17.

Generally, it is counted from the first day of the last menstrual period, plus 9 months and 7 days.

B ultrasound on time, but all kinds of algorithms will have a little error, and the baby is born on the due date very few.

On December 19, the actual delivery day can be 1-2 weeks apart.

Introduction: Because it is difficult for every pregnant woman to accurately judge the time of conception, it is medically stipulated that the expected date of delivery is calculated from the first day of the last menstrual period, and the entire pregnancy period is 280 days, 10 gestation months (each gestation month is 28 days). Let me introduce you to the calculation method of the due date, let's find out together!

1.Last menstrual period is calculated

The due date is calculated by adding 9 or subtracting 3 to the last menstrual period, and adding 7 to the day. If you use the lunar calendar, the month is calculated in the same way, and 15 is added to the day instead.

2.Fetal movement time inference algorithm

The time of fetal movement in primiparous women is generally between 18 and 20 weeks, and the time of fetal movement in pregnant women who give birth again is generally two weeks earlier than that of first-time mothers, so at 16-18 weeks. The fetal movement can be fetal movement at that time, so the formula for calculating the expected date of delivery is: due date of primiparous women = date of fetal movement + 20 weeks.

Due date of multiparous women = date of onset of fetal movements + 22 weeks.

3.Body temperature curve inference algorithm

The lowest segment of the basal body temperature curve is the time of ovulation of the woman, and the last day of the low temperature segment of the basal body temperature curve can be used as the ovulation day, and 264-268 days from the date of ovulation can be extrapolated, or 38 weeks.

Supercheck inference algorithm

The doctor can estimate the gestational age and calculate the expected date of delivery by measuring the diameter between the biparietal head of the fetal head, the length of the head and the hip and the length of the femur.

5.Early pregnancy response inference

Early pregnancy reactionMorning sickness generally occurs about 42 days after the last menstrual period, and 280 days backwards is the expected date of delivery, so the calculation formula should be the expected date of delivery = the date of first pregnancy reaction + 34 weeks.

6.Fundal height inference algorithm

If the time of a woman's last menstrual period is not clear, the expected date of delivery can be determined according to the height of the uterine fundus, and this calculation is generally only known to professionals.

7.Pregnancy calendar algorithm

Using a commercially available pregnancy calendar in the form of a simple or disc, the number of weeks of pregnancy and the expected date of delivery can be calculated by comparing the date of the last menstrual period. This method and the inverse menstrual algorithm may differ by day.

According to medical regulations, the expected date of delivery is calculated from the first day of the last menstrual period, and the total duration of the pregnancy is 280 days, with 10 gestational months (each gestation month is 28 days). Pregnant women give birth within 38-42 weeks of gestation, both at term. Since the length of each woman's menstrual cycle varies, it is normal for the estimated due date to differ from the actual due date by 1-2 weeks.

The main calculation methods are as follows:

Calculated based on the last menstrual period:

The month of the last menstrual date plus 9 or minus 3 is the number of months of the expected date of delivery; The number of days plus 7 is the expected date of delivery. For example:

Ms. Zhang's last menstrual period was 13 March 1999 and her due date was 20 December 1999.

Ms. Lee's last menstrual period was 28 May 1999 and her due date was approximately 5 March 2000.

Pregnant women can also be extrapolated from the first day of their last menstrual period to the 280th day of their due date.

Calculated based on the date of fetal movement:

If you can't remember the date of your last menstrual period, you can calculate it based on the date of the fetal movement. Usually fetal movements begin at 18-20 weeks after pregnancy. The calculation method is as follows: the day of fetal movement plus 20 weeks for primiparous mothers; In multiparous women, the day of fetal movement plus 22 weeks is added.

Calculated from basal body temperature curve:

The last day of the low temperature segment of the basal body temperature curve is taken as the day of ovulation, and 264-268 days are extrapolated backwards from the day of ovulation, or 38 weeks are added.

Extrapolated from B-ultrasound examination:

The doctor can estimate the gestational age and calculate the expected date of delivery by measuring the biparietal diameter of the fetal head, the length of the head and hip and the length of the femur by doing B ultrasound (this method is mostly used as a doctor's B ultrasound examination and diagnosis).

Extrapolation from the time of the onset of morning sickness:

Morning sickness usually occurs at the end of 6 weeks of pregnancy, that is, 42 days after the last menstrual period, and the due date is calculated backwards to 280 days.

The due date is calculated based on the time of your last menstrual period, so you can only calculate that your due date will be around March next year, but there is no time limit for having a boy or a girl.

Calculated from the first day of the last menstrual period: the month of the expected date of delivery is the month of that month, if it is greater than 3, subtract 3, and if the month is less than 3, add 9 to the month of birth, date: If the lunar calendar is calculated as the date of the last menstrual period plus 14 days, it is the date of birth.

In the Gregorian calendar, 7 days are added to the date of birth.

The day after the last menstrual period is the first day of pregnancy! 40 weeks, 280 days!

The month of the last menstrual period minus 3 or add 9 to the day of the last menstrual period plus 7 is the due date!

The due date is calculated as the number of months of the last menstrual period plus 9 (or minus 3) and the number of days plus 7Your due date is March 29.

A full-term pregnancy lasts about 280 days (about 40 weeks), and all births at 38-42 weeks of pregnancy are full-term pregnancies.

Giving birth within two weeks before or after the expected date of delivery is normal.

Hello. I had my last period on April 7. It's only been 21 weeks since I went to do 3D on October 13, so how many weeks should I be now? Thank you.

From the last menstrual period, the month is minus 3 or plus 9, the date is the solar calendar plus 7, the lunar calendar plus 14, and a gestational week is 280 days, which varies from person to person, so it is normal to advance or postpone the due date by two weeks.

The date of the last menstrual period, the Gregorian month plus nine or minus three, the date plus seven! Add nine or subtract three to the lunar month, and add fifteen to the date!

That is, 280 days from the last menstrual period, and 266 days from the date of fertilization!

Good luck getting pregnant!

Hello, the time of the due date is generally calculated according to the time of your last menstrual period, generally the month minus three or plus nine, the date plus seven is your due date time.

Wishing you health and beauty!

Hello, according to the timing of menstruation, I am currently 36 days pregnant. At present, you can continue to take folic acid until three months, pay attention to reasonable nutrition, and have regular work and rest. Maintain a good mood, be active appropriately, and have regular prenatal check-ups.

Wishing you good health!

Hello. Subtract 3 from the month of the last menstrual period (plus 9 if it is insufficient) or add 9 directly to the month, and add 7 to the number of days to the expected date of delivery. Your loved one's due date is October 15, 2011.

Hello, you are currently 36 days pregnant, the expected date of delivery is October 15, 2011, you can take folic acid orally within 3 months of pregnancy, reasonable nutrition, pay attention to rest. After 3 months, you can go to the hospital for the first check-up, create a card, etc. Regular prenatal check-ups are also important.