Pregnancy and childbirth, how do I calculate the period of my pregnancy

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It is difficult to know when the pregnancy occurred due to not knowing the time of ovulation, but measuring the period of pregnancy depends on an estimate based on the last menstrual period of a pregnant woman, as the real pregnancy occurs in the period between 11-21 days after the first day of the last menstruation for women who have a menstrual cycle Regular, these are the methods used to calculate the period of pregnancy: [1]

Another menstrual period

If the mother’s menstrual cycle is regular, pregnancy can be calculated from the date of the first day of the last menstrual period, but this method cannot be followed when the menstrual cycle is irregular, or when the mother does not remember the date of her last period. [1]


Ultrasound, through which the age of pregnancy can be measured five or six weeks after the last menstrual period of the mother, and the measurement in this way is accurate early in pregnancy, meaning that the best time to estimate the gestational age in this way is in the period between 8-18 weeks of pregnancy, [1] and the period of pregnancy is measured in this way by following several methods, including: [2]

Gestational sac (GA): The gestational sac is the structure that surrounds the fetus inside the uterus, and contains the developing fetus and the fluid surrounding it. It can be seen through ultrasound early in pregnancy, and by measuring this cyst, the gestational age can be determined with an accuracy of 5 days.

Yolk sac: The yolk sac is a membranous sac related to the fetus, and its function is to nourish the fetus before the development of the placenta and the arrival of blood circulation.

Head circumference (HC): It is based on the measurement of the head circumference and takes place after 13 weeks of pregnancy.

Thigh length (FL): The longest bone of the fetus is measured, and it expresses the longitudinal growth of it, as this length increases from 1.5 cm in the fourteenth week to about 7.5 cm during pregnancy, and there are special tables for this measurement that are relied upon in the comparison of the thigh length Current at the expected length from the table, thus determining the gestational age.

The diameter between the sides of the head (BPD): This is measured after the diameter at 12 weeks of pregnancy, and is increased

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