It is possible to detect pregnancy on the 7th day of ovulation. After ovulation, it takes about 24 hours for the sperm and egg to unite and form a fertilized egg, and about 6-7 days for the fertilized egg to be implanted. Since the number of days of menopause is too small, the possibility of false negative is very high and it needs to be retested after 3 days. To test whether you are pregnant, it is best to determine the HCG value in the blood through a venous blood test about 10 days after intercourse, when the fertilized egg is clearly implanted and there will be no false negatives. To detect if you are pregnant by early pregnancy test, you should test 5 days after the time when you should have your period, and if you are pregnant, most of them are positive or weakly positive. To increase the chances of pregnancy, you should have intercourse during ovulation to facilitate conception, keep a good state of mind, pay attention to rest and avoid exertion to facilitate better fertilization of the egg.