Calculating gestational age based on ovulation period is a commonly used calculation method that can help pregnant women estimate the growth stage of the fetus in the belly. However, it's worth noting that this calculation method is not always accurate, as the fetal growth rate can be affected by a variety of factors. Therefore, when estimating gestational age, pregnant women should determine it based on their menstrual cycle and B-ultrasound examination. In this article, we will introduce the method of calculating gestational age based on ovulation period and how to determine gestational age based on B-ultrasound examination.

Calculating the gestational age based on the ovulation period is a commonly used calculation method. It is based on the pregnant woman's menstrual cycle and determines the pregnancy time of the pregnant woman by calculating the woman's egg discharge time and sperm entry time. Generally speaking, the menstrual cycle of a pregnant woman is 28 days, so based on the 28-day cycle, the ovulation period of a pregnant woman is the 14th day of the menstrual cycle. After this day, the pregnant woman's egg begins to mature and is gradually discharged. If the sperm successfully enters the pregnant woman's body, it may combine with the egg and form a fetus.

However, it should be noted that since a pregnant woman's menstrual cycle may be affected by a variety of factors, such as mood, stress, diet, etc., calculating gestational age based on ovulation is not always accurate. In addition, pregnant women can also determine their gestational age through B-ultrasound examination, which is more accurate.

How to determine gestational age with B-ultrasound examination

When pregnant women use the method of calculating gestational age based on ovulation period to estimate the growth stage of the fetus in the belly, they may find that their estimated gestational age does not match the actual gestational age. This may be because the fetus is growing faster than estimated, or because the mother has shorter or longer menstrual cycles. In this case, pregnant women should combine B-ultrasound examination to determine the gestational age.

B-ultrasound examination is a method of determining the gestational age by measuring the size and shape of a pregnant woman's abdomen.