Normally, the blastocyst will start to secrete HCG immediately after it has successfully implanted, and usually after 1-2 days of secretion, the level of chorionic gonadotropin and the level of progesterone in the blood will rise significantly, and pregnancy can be detected with a more accurate test. In order to be sure of pregnancy and to avoid false negatives, it is recommended to check the blood chorionic gonadotropin and progesterone 3 days after the blastocysts have been deposited. If normal conception is possible, it can be detected. If a urine pregnancy test is performed, it is usually recommended that the patient be tested one week after the blastocyst has been laid. During this time, the patient’s urine HCG concentration is relatively high, and a morning urine test will detect pregnancy more accurately, with very little chance of a false negative.