How long does it take to detect conception is mainly related to the testing method and individual factors, and should be analyzed specifically, not generalized. For women with regular menstrual cycles, pregnancy can usually be detected by blood HCG test about 7-10 days after intercourse. In addition, gynecological ultrasound can identify intrauterine pregnancy, and most women can have an ultrasound examination around 35-40 days after menopause, which will reveal a gestational sac in the uterus. In the case of women with delayed menstruation, they may need to wait another 3-5 days or so for the test, which varies from person to person. In addition, some women may experience early pregnancy reactions, such as nausea, vomiting, dizziness, fatigue, etc. It is recommended to keep a happy mood, eat a light diet, eat more foods rich in folic acid and take regular pregnancy tests.