The combination of sperm and egg will form a fertilized egg, which will take about 7 days to complete the process of implantation under smooth conditions, but the implantation is not necessarily on the endometrium, there is also the possibility of ectopic pregnancy, most pregnant women cannot sense the implantation of the fertilized egg, only a small percentage of pregnant women will have abdominal pain or vaginal bleeding, but these conditions vary from person to person. If you are not sure if you are pregnant, you can have a blood test about 10 days after intercourse, and if the result is positive, you can initially determine that you are pregnant. If there is a subsequent delay in menstruation, you can go to the hospital after the menopause for a checkup, and you can basically confirm the pregnancy.