If there is a history of abortion, it is not clinically detectable because after abortion, the cervix does not change locally and the ectocervix is still round. In the case of a large induced abortion or after childbirth, the cervix is transversely cleft, which can be detected by gynecological examination. Therefore, a history of abortion will not be detected by gynecological examination after an abortion. The safest method of contraception is to use condoms during the whole process of sexual life, which is safe, hygienic, simple, convenient and does not have any side effects.