Some women may experience slight pain during the process of egg implantation. After the formation of the fertilized egg, the slight uterine contractions and cramps that occur during the process of implantation lead to a low probability of painful implantation of the fertilized egg, and only a small percentage of people may experience such a physiological reaction. There are two ways to test for pregnancy after sex: blood test and urine test, which can be used to determine pregnancy based on changes in human chorionic gonadotropin, and blood test, which can be detected more than 7 days after intercourse. The urine level of human chorionic gonadotropin can be detected more than 14 days after intercourse. As long as the time requirement is met, the accuracy of the test is relatively high, and it is not possible to determine whether a fertilized egg has been laid by whether there will be pain.