It is normal to see the gestational sac on ultrasound about half a month after the fertilization of the egg and to see the yolk sac inside the gestational sac. At about 50 days after implantation, the primordial heartbeat can be seen by ultrasound. It is recommended that if the pregnancy continues, an ultrasound examination can be done at around 50 days, and it is also recommended to go to the obstetrics department for further laboratory tests, such as checking the liver and kidney functions, screening for AIDS and syphilis, eugenic five tests, and the determination of the surface antigen of Hepatitis B, the routine leukorrhea, and electrocardiograms, which are mainly to find out the basic health conditions of the body. It is recommended that a maternal health card can be established in the third month of pregnancy.