The fetal heartbeat can be detected by ultrasound examination usually 6-7 weeks after pregnancy in women with regular periods. Ultrasound is an essential part of a woman’s pregnancy checkup and is used early on to confirm early intrauterine pregnancy. When the pregnancy is 35 days old, the ultrasound can detect the gestational sac and yolk sac. At 42 days of pregnancy, the ultrasound can detect the germ. At 49 days of pregnancy, the ultrasound can detect primitive vascular pulsations. At 63 days of gestation, the formation of the fetus and the appearance of the amniotic sac wrap can be seen on ultrasound. at 12 weeks, the formation of the placenta and the appearance of the fetus and fetal appendages can be seen on ultrasound. If the germ and primitive vascular pulsations do not appear as expected in the early stages of pregnancy, it is indicative of poor fetal development. At 18-20 weeks of gestation, fetal heart sounds can be heard with a stethoscope passing over the abdominal wall of the pregnant woman. The fetal heart sounds are binaural, resembling the ticking of a clock, and are fast, with a normal rate of 110-160 beats per minute. After a woman is diagnosed with early intrauterine pregnancy and the fetal heartbeat is detected by ultrasound, it is recommended to go to the obstetrics clinic of the hospital to build a pregnancy test card and have regular maternity checkups to detect the growth and development of the fetus in the uterus in a timely manner.