There are several clinical options to check if a woman is pregnant: First, blood tests to check the hormone levels in the body, for example, blood can be drawn to test for increased levels of sex hormones, luteinizing hormone and other hormones in the blood. Because these hormones are produced by the placenta and are the first hormones produced, if the level of human chorionic gonadotropin in the blood is elevated, you are pregnant. Second, check the endocrine function of the woman, because the endocrine function of the woman will rise briefly after pregnancy, especially the estrogen, progesterone and follicle stimulating hormone in the body, and the content of these hormones will rise significantly. Third, ultrasound can be done to determine whether a woman is pregnant or not, even in the early stage of pregnancy.