When calculating the due date, some women do not know how to calculate it, and some women do not even know when their menstrual cycle will end. In such cases, calculations can only be made through ultrasound or fetal movements. The calculation of the due date, some women say it is calculated from the last menstrual period, while others say it is calculated from the end of the last menstrual period. Let me tell you, is the due date calculated from the end or beginning of the last menstrual period?
In clinical practice, for women with a menstrual cycle of one month, the estimated due date is calculated from the first day of the last menstrual cycle. The last menstrual period refers to the beginning of the last menstrual period, not the day it ends.
Pregnancy is calculated based on the last menstrual period, not the duration of intercourse. The ovulation period is influenced by many factors, so the last menstrual period should be taken as the standard. The expected delivery date is only an estimate, and the actual delivery time often differs from the expected date by 1-2 weeks.
The total number of days of pregnancy is 280 days, which is calculated from the first day of the last menstrual period. It is usually two weeks earlier than ovulation or fertilization, and three weeks earlier than implantation. If the menstrual cycle is irregular or the last menstrual period is forgotten, the estimated due date should be calculated from the time of early pregnancy reaction and the first feeling of fetal movement. It is also possible to calculate the number of days of pregnancy by examining the size of the gestational sac and the biparietal diameter of the fetus through ultrasound examination.
