If reasonable contraception is used during sex, pregnancy is very unlikely, but there is no 100% guarantee of contraception. Neither condoms, pills nor rings are absolutely safe, but are only effective to a certain extent in reducing the chances of pregnancy. When used completely and correctly, the contraceptive efficiency of condoms is about 98%, that of short-acting contraceptive pills is about 99.7%, that of intrauterine sterilization (with an IUD) is about 99.8%, and that of subcutaneous contraceptive injections is about 99.95%. Not to mention the fact that there will be cases of improper use due to the limitations of the conditions of use and the way of use. However, there is no need to be nervous, generally reasonable and correct use of contraceptives, the chances of pregnancy will be very small, do not need to worry too much, normal contraceptive measures can be done.