The time of heart ultrasound examination during pregnancy is as follows: 1. If the mother herself does not have any special conditions, such as no heart disease, heart panic, breath-holding and other abnormalities, and a series of diseases such as hypertension can be ruled out, the time of heart ultrasound examination is 36 weeks of late pregnancy; 2. The time of fetal heart ultrasound examination during pregnancy is 24-28 weeks of pregnancy, and the fetal heart must be examined proudly at the same time of the examination of the major abnormalities ultrasound. If there is any abnormality, you can review the fetal heart within a short period of time.