Under normal circumstances, pregnancy may be detected 7-9 days after ovulation; non-ovulatory intercourse is less likely to result in pregnancy. When the fertilized egg is deposited and begins to develop it means that conception has occurred. Normally, if you have intercourse during ovulation, the sperm and mature egg meet in the fallopian tube to form a fertilized egg, a process that takes about 24 hours. The fertilized egg then develops and gradually moves towards the uterine cavity, reaching the uterine cavity and implanting in the uterine lining about 6-8 days after fertilization, so pregnancy can be detected about 7-9 days after coitus during ovulation. The earliest way to determine if you are pregnant is to take a blood test to check for HCG, but it is less likely that you will become pregnant if you have intercourse when you are not ovulating. Pregnancy usually results in a series of changes in the body, such as menopause, nausea, regurgitation or loss of appetite, and fatigue. Therefore, women of childbearing age who experience these symptoms need to pay attention and should go to the obstetrics and gynecology department of the hospital for relevant examinations to clarify whether they are pregnant or not.