Generally, blood can be drawn to check for pregnancy about 8 to 9 days after intercourse, but there are individual variations. After intercourse, fertilization is completed within 24 hours after ovulation, and the embryo will be able to lay down and start to secrete HCG (human chorionic gonadotropin) 6-7 days after fertilization. HCG can be detected in the mother’s serum one day after laying down, so blood can be drawn to check the level of HCG to confirm the pregnancy about 8-9 days after intercourse. However, due to the influence of factors such as the menstrual cycle and the time of ovulation, there may be individual differences. After pregnancy is confirmed by blood HCG test, ultrasound examination is also performed at about 40 days after menopause to confirm normal intrauterine pregnancy and to exclude pathological pregnancy such as ectopic pregnancy and gravida. During early pregnancy, you should continue to take folic acid as prescribed by your doctor, increase nutrition, rest properly, avoid strenuous exercise and exertion, and take obstetric checkups on time.