If a condom is dislodged inside the body during use, this is a contraceptive failure and the sperm still has a chance to enter the uterus, potentially leading to pregnancy. If you happen to be at a stage where you are prone to pregnancy, it is important to take remedial measures afterwards, such as taking the morning-after pill. Condoms are a very common form of contraception, safe and hygienic, and relatively reliable in their effectiveness. However, the best contraceptive effect can only be achieved if the condom is used correctly. If the condom falls off during use, or if the condom is not used throughout, or if the condom is broken, etc., it will lead to contraceptive failure. Therefore, it is important to see if the condom is leaking before wearing it, and to use the correct method. If a condom falls off in the vagina, it should be removed in time, as failure to do so can increase the risk of infection.