Ejaculation during pregnancy does not affect the development of the fetus. After ejaculation, most of the semen will be expelled from the vagina, and only a small amount of sperm will enter the uterine cavity. Since the ovaries no longer ovulate during pregnancy, the sperm will not be able to combine with the egg and will die on its own after about 2-3 days, so it will not affect the fetus. It is recommended to pay attention to the following points when having sex during pregnancy: 1, pay attention to sexual hygiene, wash the vulva before and after sex, to avoid pathogenic bacteria infection. 2, the action must be gentle and avoid roughness, so as not to stimulate the uterus to cause contractions resulting in pre-miscarriage of the first sign of miscarriage, such as the occurrence of vaginal bleeding or pain in the lower abdomen.