The normal value of hcg at 30 days of pregnancy should be greater than 100lU/L, and the specific value is closely related to the length of the menstrual cycle. Take 28 days of menstrual cycle as an example, the normal pregnancy when the fertilized egg is in bed, usually on the 6th day after ovulation, the formation of the trophoblast of the fertilized egg will start to produce hcg, about a day later the human chorionic gonadotropin in peripheral blood can be detected, after that it will rise twice every 1.7-2 days and can reach 100IU/L on the 14th day after ovulation. but if the menstrual cycle is less than 28 days, the However, if the menstrual cycle is less than 28 days, the hcg value may be higher than 100 IU/L. If there is a delay in menstruation, the hcg value may still not be measured at 30 days of pregnancy. If the hcg level remains at a low level for 7 days and does not increase exponentially, the possibility of ectopic pregnancy should be highly suspected.