There is no way to know if you are pregnant the day after you have sex. It takes a certain amount of time for the sperm and egg to unite and form a fertilized egg after intercourse, usually about 24 hours or a few days. It takes 6-7 days for the fertilized egg to enter the uterine cavity and find a suitable place to settle and grow. Therefore, it is not possible to tell if you are pregnant the day after the procedure. If you want to know if you are pregnant as soon as possible, it is recommended that you go to the hospital 10 days after intercourse to have a blood test for HCG to determine.