Condoms are a common form of contraception and are widely used in clinical practice. The correct use of condoms is also the key to successful contraception. When you have sex during ovulation, using a condom can prevent sperm from entering the uterus, thus avoiding the union of sperm and egg and playing a contraceptive role. Ovulation is located in the middle of the menstrual cycle, the period when the ovaries ovulate and is the most important period when pregnancy is possible. In general, if you have sex during ovulation, you can avoid pregnancy by using condoms during ovulation if they are used correctly. Basically, the contraceptive effect can reach 100%. However, it should be noted that when using condoms, it is important to avoid dislodging or damaging the condom. If a condom falls off or is damaged, the sperm can still enter the uterus and pregnancy can occur. Therefore, when having sex during ovulation, it is recommended to avoid strenuous activities. Once the leakage of sperm occurs, it is usually undetectable, resulting in an unplanned pregnancy and failure of contraception. In the event of contraceptive failure, other forms of emergency contraception are available. In summary, the use of condoms during ovulation is generally not associated with pregnancy.