It takes a week after sex to get pregnant. Usually, you need to go to the hospital to have a blood test for HCG in your blood to determine pregnancy. It is best to have intercourse during ovulation, when the chances of pregnancy are greater than. A woman’s ovulation date is usually about 14 days before her next menstrual period. It is best to have an ultrasound examination in time to observe the development of the follicles. It is advisable to have intercourse on alternate days during ovulation to help get pregnant. Note that the gestational sac can enter the uterine cavity at 40 days of pregnancy, and the fetal heart and germ can appear at about 50 days of pregnancy. It is best to have regular ultrasound examinations to observe the development of the baby, and as long as the baby develops normally, there is nothing to worry about. It is best to eat more foods with high protein content, such as beef and mutton, soy products, etc. It is also recommended to take reasonable vitamin supplements to help the baby develop, etc.