Normally, you can have a fetal heartbeat at 6 weeks of pregnancy. At this time, the fetal heartbeat can only be monitored by ultrasound. Because the gestational sac is small, the uterus is small and the uterus is still in the pelvic cavity, fetal heart sounds cannot be heard in the abdomen at this time. After the 12th week of pregnancy, the fetal heartbeat can be heard with a fetal heart monitor in the abdomen after the uterus has enlarged and protruded into the pelvic cavity. The normal fetal heart rate is 110-160 beats per minute, but in early pregnancy, the fetal heart rate may increase slightly and may be around 170 beats per minute. In middle and late pregnancy, the fetal heart is usually in the range of 110-160 beats/min. After 36 weeks of pregnancy, if there is nothing wrong with the prenatal examination, fetal heart monitoring can be started at 36 weeks. Fetal heart monitoring is usually done for 20 minutes. At this time, fetal heart monitoring can be a good response to the fetal heart condition and you can see more visually what is going on in the uterine cavity. If the fetal heart rate decreases or increases, you should be alert to the presence of intrauterine hypoxia.