If you go in and don’t ejaculate, you generally won’t get pregnant, but if there is a small amount of semen discharged there is a possibility of pregnancy. Pregnancy is formed after the combination of sperm and egg, the sperm exists in the semen, so if there is no ejaculation, generally will not be pregnant; but the male did not ejaculate, does not mean that there is no semen flow, so if the menstrual period is delayed still have to be vigilant about the possibility of pregnancy. For both men and women, if there is no reproductive requirements, it is recommended that they do a good job of contraception through condoms and other means to avoid unwanted pregnancies, but also recommended to do a good job of cleaning before and after sex to reduce the occurrence of gynecological inflammation. If a woman has delayed menstruation after unprotected sex, she should be alert to the possibility of pregnancy, and if necessary, she should use early pregnancy test paper or go to the gynecology department of a regular hospital to have a blood test.