The lack of internal ejaculation after intercourse can also cause pregnancy, because in the process of intercourse the man has a small amount of semen into the vagina, these semen contains sperm, if there is a healthy sperm may lead to pregnancy, so ejaculation is a kind of insecure contraceptive measures. If you don’t want to have children, you must do a good job of effective contraception, such as men can wear condoms, women can also be placed in the intrauterine device, or oral short-acting oral contraceptive pills, these contraceptive measures are very effective. If a woman does not have her period when it is due, she should go to the hospital to have blood tests to check her chorionic gonadotropin level.