Pregnancy can usually be detected about 2 weeks after intercourse, there is no latest time to detect pregnancy, the exact time varies from person to person. Pregnant women who are preparing for pregnancy can usually have their blood HCG (human chorionic gonadotropin) levels measured about 10 days after ovulation to confirm pregnancy, while pregnancy can be detected with pregnancy test strips about 2 weeks after intercourse because HCG appears relatively late in the urine. After pregnancy is confirmed by pregnancy test or blood HCG measurement, ultrasound examination should be done at about 6 weeks after menopause to confirm normal intrauterine pregnancy. And pay attention to proper rest, appropriate increase in diet and nutrition, avoid strenuous exercise, follow the doctor’s advice to continue to take folic acid, and under the guidance of the doctor on time for prenatal checkups.