HCG doubling is normal, and there may also be no fetal heartbeat or buds if the pregnancy is short. However, if it is time for the appearance of fetal heartbeat and buds, it will usually be checked. HCG can be detected by blood sampling in early pregnancy, and the development of the fetus can be observed by rechecking the HCG. However, fetal heartbeat and fetal buds are detected by obstetric ultrasound. It needs the fetus to develop to a certain time to appear. If the ultrasound is performed earlier, the fetal heart buds may not be seen. However, a normal doubling of HCG generally indicates that there are no major problems with fetal development, and fetal heart buds can be seen by 6-7 weeks of pregnancy. Of course the exact time varies from person to person, some embryos develop later, may not appear until 8 weeks of pregnancy. If there is still no fetal heartbeat at 8 weeks, we should consider the possibility of embryonic arrest and need further examination.