The fertilized egg is ovulated for 7-8 days and most of them will be laid in the uterine cavity. After a woman has had sex during ovulation, if the egg is able to unite with sperm and develop into a fertilized egg, the fertilized egg will move from the fallopian tube to the uterine cavity where it will take about 7-8 days to implant and grow. If the fertilized egg is slow to develop or moves slowly, it may take about 10 days for the egg to settle in the uterine cavity, which is normal. Women with high expectation of pregnancy should pay attention to proper rest, increase nutrition, avoid cold and flu after having sex during ovulation. A blood test 7-8 days after sex for elevated human chorionic gonadotropin level, more than 25 IU/l, can be highly suspected of early pregnancy. In order to diagnose normal intrauterine pregnancy, blood test for human chorionic gonadotropin level will reach more than 4000 IU/l about 7 days after the postponement of menstruation, and there will be the growth of a gestational sac in the uterine cavity.