The fertilized egg will come to term about a week after fertilization. Fertilization occurs within 12 hours after ovulation and the entire fertilization process takes about 24 hours. The fertilized egg moves towards the uterine cavity about 30 hours after fertilization and lays about a week afterwards. However, it is very difficult to determine whether fertilization has occurred or not, and there are no clear symptoms during this period. The main thing to do during the preparation period is to pay attention to the regularity of life, maintain a good mood and avoid exposure to harmful substances. You can determine if you are pregnant by taking a blood test for HCG 10 days after having sex during ovulation, or you can use an early pregnancy test two weeks later to determine if you are pregnant. If you are pregnant, you should avoid sexual intercourse and strenuous exercise in the third trimester to avoid miscarriage and take oral folic acid to prevent abnormalities in fetal nervous system development.