It is more accurate to take a blood test for HCG in early pregnancy to clarify pregnancy. Women with regular menstrual cycles who experience menopause can determine if they are pregnant by taking a blood HCG test. Sperm and egg are usually planted in the endometrium on the 6th day of fertilization, and the trophoblast cells of pregnancy start to secrete HCG on the next day, so you can judge whether you are pregnant by the rise of HCG in the blood serum, which is relatively accurate. However, the rise in blood HCG is not only limited to pregnancy, women may have trophoblastic tumors after abortion or gravidarium, and the HCG value in the body will also be high, but it is not a normal pregnancy. The presence of endocrine diseases, such as hyperthyroidism and pituitary tumors, can lead to increased HCG values in the body. In some women, the luteinizing hormone in the body is elevated after the removal of the ovaries, and the HCG test will also be elevated. Therefore, to confirm whether intrauterine pregnancy in early pregnancy, in addition to blood HCG, but also combined with ultrasound examination and other comprehensive judgment.