In early pregnancy, HCG, also known as human chorionic gonadotropin, is not normal as long as it rises, but depends on whether it doubles at 48-hour intervals. The growth of HCG after pregnancy does not reflect the normal development of the fetus, but the doubling of HCG depends on the rate of increase. Under normal circumstances, the growth rate of HCG is very fast, generally it needs to increase by more than 60% in 12 hours interval and double in 48 hours interval, so it is not normal for HCG to increase in early pregnancy, but as long as it can double in 48 hours interval, there is generally no big problem. As the gestational week increases, ultrasound examination is needed to see if the gestational sac can appear normally, as well as to see if the fetal heartbeat and fetal bud can appear normally.