Normally, the germ and primordial heart tube beats usually appear at 6 weeks + of pregnancy if menstruation is regular. Most women have an abdominal ultrasound in the 7th week of pregnancy to detect the fetal bud and heartbeat. If a vaginal ultrasound is performed, the fetal heartbeat and germ will be detected one week earlier than the abdominal ultrasound. For women with regular menstruation, at more than 5 weeks of pregnancy, the ultrasound can see the intrauterine sac in the uterus. The sign to determine that it is a fetal sac is to see the yolk sac, and seeing the yolk sac determines that it is an intrauterine pregnancy and not an ectopic pregnancy. At 6 weeks of pregnancy under ultrasound monitoring, the fetal bud and fetal heart can be seen in the uterine cavity. Normally, the fetal bud and the primordial fetal heartbeat can be detected at 8 weeks of pregnancy. If the fetal bud and fetal heartbeat are still not visible, the possibility of fetal abortion is considered more likely. The fetus and its appendages, including the placenta and amniotic fluid, may appear at 12 weeks of pregnancy. In the case of women with irregular menstruation, the date of the last menstruation and thus the gestational week needs to be projected from the first ultrasound report, and a recheck is needed until the fetal bud and fetal heart are seen to be considered a normally developed embryo. If the yolk sac is seen on the first ultrasound, the fetal heart and fetal bud will be seen after 1 week generally. If the fetal bud and fetal heart are not seen after 11 days in the case of the yolk sac, or after 2 weeks in the case of the yolk sac without the fetal bud and fetal heart, you need to suspect possible embryonic abortion and must seek medical attention as soon as possible.