Non-increase of HCG (human chorionic gonadotropin) in pregnancy may be related to physiological reasons such as too few days of pregnancy, or pathologic reasons such as poor embryonic development and ectopic pregnancy. 1. Physiological reasons: if the number of days of pregnancy is too short, the fertilized egg has not yet completed its implantation, and it is in the first few days of pregnancy, at this time the increase of HCG is not obvious. 2. Pathological reasons: due to poor embryonic development, ectopic pregnancy, embryonic arrest and other reasons, can not stimulate the production of HCG, the phenomenon of HCG does not grow, or even lead to a decline in HCG. There may be other reasons why HCG does not grow in pregnancy. It is recommended to go to the hospital for ultrasound examination to check whether it is an intrauterine pregnancy and whether there is fetal heartbeat and buds, etc., and to carry out the relevant treatment under the guidance of the doctor.