A normal electrocardiogram in late pregnancy and the absence of heart disease usually eliminates the need for a cardiac ultrasound. An electrocardiogram is a test to determine the presence of arrhythmia, myocardial ischemia, the speed of the heartbeat, and whether there is a problem with the pacing and conduction system. A cardiac ultrasound is a test to determine the size of the chambers of the heart, the thickness of the walls of the chambers, the extent of wall motion, the opening and closing of the valves, and the function of systole and diastole. Cardiac ultrasound is not a mandatory test during pregnancy, and you do not need to get a cardiac ultrasound if you have a normal body checkup in all aspects of your pregnancy, no heart disease, and normal EKG results. If the electrocardiogram is normal in late pregnancy, but there is a murmur when the heart is auscultated and other problems, you need to have a cardiac ultrasound to rule out problems of organic heart disease, such as congenital heart disease and rheumatic heart disease. Do a good maternity checkup in late pregnancy and let your professional doctor determine what needs to be checked during pregnancy.