Women will do all kinds of prenatal checkups when they get pregnant, and the first ultrasound will be done at around 8 weeks of pregnancy to determine whether the development of the fetus is normal or not. Ultrasound at 8 weeks of pregnancy mainly checks for fetal heartbeat and fetal buds. Some pregnant women are very anxious because they don’t see the fetal heartbeat and are advised not to be overly nervous. Generally speaking, the development of the embryo needs at least 30 days to 40 days to form the sac, and 40 days to 50 days to form the germ. Generally speaking, it is recommended to choose the ultrasound test around 60 days, at this time basically you can see whether the development of the sac fetal heart fetal buds is normal or not. Pregnant women receive ultrasound examination after 5 weeks of pregnancy, basically you can see the fetal buds, as well as the primitive heart tube beat, the earliest fetal heart can be seen in about 6 weeks, but there are some fetus development is slow, may be in about 8 weeks before the appearance of the above situation shows that the development of the fetus is relatively healthy, but if after 9 weeks of pregnancy still do not see the existence of the fetal heart, you should pay attention to it. should be taken seriously. Fetal buds and fetal heart is an important criterion for the healthy development of the baby, some babies may stop developing due to various reasons, which should be taken seriously, and it is better to find out and receive treatment in time.