There are more ways to detect pregnancy, including blood HCG tests, pregnancy tests, ultrasound tests, etc. The time to detect pregnancy varies with different tests. Usually, blood HCG test can detect pregnancy around 7-10 days after menopause; pregnancy test can detect pregnancy around 10-14 days after menopause; ultrasound test can detect pregnancy around 5 weeks after menopause. HCG is a hormone secreted by trophoblast cells after pregnancy, and pregnancy can be determined by detecting HCG levels in blood or urine. Generally speaking, blood HCG can be detected about a week earlier than pregnancy tests, and its accuracy is relatively high. Ultrasound is relatively late. Ultrasound can not only determine whether you are pregnant or not, but also identify the location of the pregnancy and rule out ectopic pregnancy. If menopause occurs for more than one week after intercourse, you can first use a pregnancy test or blood test to determine whether you are pregnant or not, and then under the guidance of a physician, you can use ultrasound to further understand the location of pregnancy and determine whether it is intrauterine pregnancy.