Normally, pregnancy can be determined by a blood test for chorionic gonadotropin HCG more than 10 days after intercourse. If a pregnancy test is used, it is recommended that the test be performed at least 7-10 days after the menstrual cycle for more accurate results. Blood HCG can be used to determine pregnancy at the earliest, i.e. 10 days after intercourse, by taking a blood test for hcg. If two red lines of the same shade appear, pregnancy can be considered, and it is more accurate to check the morning urine of the subject. However, the above methods can only highly suspect early pregnancy and cannot diagnose normal intrauterine pregnancy. The development of the embryonic sac can be checked by abdominal or vaginal ultrasound more than 40 days after menopause to keep abreast of the fetal development and also to exclude ectopic pregnancy. If a woman’s menstrual cycle is irregular or the fertilized egg is slow to develop, pregnancy can be detected slightly later.