If you have had your period for more than a week, you will be able to detect pregnancy by using an early pregnancy test. Clinically, when you have intercourse during ovulation, the sperm and egg will enter the uterine cavity at the latest in about half a month, and the trophoblast cells will secrete blood HCG, so a positive result can be detected. However, a positive result can only be detected by blood HCG test after menopause, and pregnancy cannot be detected by urine at this time. It is recommended to use morning urine after 35 days of menopause for testing, because the concentration of HCG in morning urine is relatively high, so the positive rate will be higher. If there is no pregnancy through the test, it is recommended to observe for another week. If there is no menstruation, another test should be done to find out if you are pregnant.