Ejaculation or non-ejaculation during a woman’s pregnancy does not have a direct effect on fetal development. If sex is performed at an inappropriate time, it may cause a premature birth or miscarriage. Ejaculation during pregnancy does not cause another pregnancy because all the channels of conception are completely closed and the semen that enters the vagina of the woman does not enter the uterine cavity again, so ejaculation does not have any direct effect. Because the process of sexual intercourse can cause a certain degree of stimulation to the cervix and uterus of the woman and cause uterine contractions, it is very easy to cause miscarriage if it is in the early stages of pregnancy. If it is in the second trimester, it is very easy to cause premature birth, so women during pregnancy can have sex in the middle of pregnancy, but not allowed to have sex at other times.