DHA can be started in the 5th month of pregnancy. It is not necessary to take DHA during pregnancy when eating a well-balanced diet, but if you want to take it, you can start taking it around the 5th month of pregnancy under the guidance of your doctor. First of all, a reasonable and balanced diet during pregnancy under the guidance of a doctor can ensure that pregnant women intake of adequate nutrition to meet the physiological needs of the mother and fetus, such as protein, calcium, iron, etc., can be increased through the appropriate intake of deep-sea fish, which can provide DHA. During pregnancy, you should also pay attention to proper rest, diet should be rich and diversified in order to better provide a variety of nutrients needed during pregnancy, but also under the guidance of the doctor to maintain a moderate amount of physical activity, to maintain appropriate weight gain. DHA is not a regular medication for use during pregnancy and can be used according to individual wishes and under the guidance of a doctor.