The appearance of bleeding in the first few days of pregnancy should exclude biochemical pregnancy, miscarriage and ectopic pregnancy. After a delay in menstruation after pregnancy and a significant increase in HCG values, if the HCG values double badly or have stopped growing and the progesterone values decrease significantly, it is considered that there are signs of miscarriage or biochemical pregnancy and the number of days of pregnancy needs to be determined. If this symptom occurs within three days of the menstrual delay, it is considered to be a biochemical pregnancy. If it occurs after one week of delayed menstruation, it is considered to be a miscarriage or ectopic pregnancy, which requires ultrasound to make an accurate diagnosis.