For women with regular menstruation, fetal bud and fetal heart can be detected by vaginal ultrasound at 6-7 weeks of pregnancy, when most pregnant women’s blood HCG can reach more than 5000 IU/L. For women with regular menstruation, the fetal heartbeat and fetal bud usually appear around 6-7 weeks after menopause. If ovulation is early or delayed, it will cause the time of conception to change accordingly, with the fetal heartbeat and fetal bud appearing as early as 30 days after menopause and as late as 60 days after menopause. If the blood HCG is checked every other day after pregnancy, it can be found that its value increases exponentially and its normal value has a wide fluctuation range, so in clinical practice, the time of fetal heartbeat and fetal germination will not be judged according to the level of HCG. It is recommended that pregnant women should go to the hospital for regular prenatal checkups after pregnancy, including vaginal ultrasound, progesterone and HCG test, to ensure the healthy growth of the fetus and deal with any problems in time.