Low blood HCG cannot usually be made up. HCG is the human chorionic gonadotropin in the body, which is mainly related to the growth and development of the fetus, and cannot be supplemented by food or drugs. In a normal pregnancy, HCG is produced when the fertilized egg is deposited, i.e. when the trophoblast layer of the fertilized egg is formed on the 6th day after ovulation, and peripheral blood HCG can be measured after about 1 day, and then it rises by a factor of 1 every 1.7-2 days. In the 14th day after ovulation, it reaches about 100U/L, and peaks at 8-10 weeks of gestation (50,000-100,000U/L), then declines rapidly, and in the middle and late stages of pregnancy, HCG is only 10% of its peak. If the blood HCG stays at a low level and does not rise exponentially when measured 2-3 days apart, ectopic pregnancy should be suspected, and then it is necessary to consult a doctor in time to terminate the pregnancy, so as not to cause hemorrhage or life-threatening problems. If the low HCG is caused by fetal growth retardation, it may not be possible to replenish it. If you have low HCG, you need to pay more attention to rest and maintain a good lifestyle, and you may recover gradually later. It is also necessary to see a doctor regularly for various tests, such as ultrasound, progesterone test, HCG test, etc., to ensure that the development of the fetus is normal.