The first month of pregnancy when intercourse caused vaginal bleeding: 1, bed rest. 2, if it has been determined that the intrauterine pregnancy, and actively given to the fetal treatment, you can intramuscular injection of progesterone, or oral progesterone pills, if necessary, you can also intramuscular injection of chorionic gonadotropin to carry out the appropriate treatment. 3, in the diet must be strengthened in order to make the embryo normal growth and development. When the vaginal bleeding significantly reduced need to check the blood HCG and progesterone, and then decide whether to stop using drugs for treatment, in the first three months of pregnancy can not be coitus, because this time the embryo is not yet stable, once the coitus stimulation may cause contractions and cause the symptoms of preterm miscarriage.