If you have intercourse on the 45th day of pregnancy and ejaculate internally, you don’t need to be nervous, if you don’t have pain in the lower abdomen, vaginal bleeding, it is recommended to keep the vulva clean, mainly to avoid pathogenic bacterial infections, you can do vulvar cleansing after intercourse, but you can’t douche the vagina, so as not to stimulate the uterine contraction, resulting in the possibility of preterm miscarriage. It is recommended not to have sex in the first three months of pregnancy, because sex will also cause sexual excitement, will reach orgasm, will stimulate the uterine contraction, in the clinical uterine contraction, may lead to the gestational sac and the uterine wall of the peel, capillary rupture of the vaginal bleeding, and even in the clinical possibility of miscarriage, so in the first trimester of pregnancy is not to have sex. So you can’t have sex in the first three months of pregnancy.