After a strong positive ovulation test, it is recommended to have intercourse within 24-48 hours of such a strong positive test to clinically improve the chances of pregnancy. This is because ovulation tests detect luteinizing hormone in the urine, and luteinizing hormone will only show a strong positive result if it reaches a peak. A strong positive signal means that ovulation will occur within 24-48 hours, so choosing to have intercourse at this time will increase your chances of getting pregnant. It is also recommended that about 15-17 days after intercourse, you can go to the hospital for a blood test to check your blood HCG to find out if you are pregnant. Because on average, it takes about half a month for the sperm and egg to combine to form a fertilized egg and enter the uterine cavity to settle, and the blood HCG will be secreted after it settles in the uterine cavity.