There is a big difference between biochemical pregnancy and embryonic arrest, biochemical pregnancy indicates that the sperm and egg fertilization, but did not attach, did not form the gestational sac, manifested in HCG is relatively low, most of them are less than 100IU / L, and menstruation delayed for seven days, or even half a month can be menstruation, after menstruation, HCG may be reduced to normal. Embryonic arrest is the ultrasound is the first to determine intrauterine pregnancy or see the fetal heartbeat, the days of menopause may find the embryo’s heart tube beat stop developing, there is still a big difference between the two, biochemical pregnancy is only fertilized, but did not land on the bed, the embryonic arrest indicates that has landed on the bed of the formation of gestational sacs or even embryonic buds, and ultimately, the gestational sacs wilted or the fetal heart stops beating. Biochemical pregnancy does not need special treatment, wait for menstruation can be, embryonic decontamination most of the termination of pregnancy or even to clear the uterus.