If you use a condom during the safe period, you will not get pregnant. If a woman uses a condom during her safe period, or during ovulation or during the danger period, and if the condom is not broken afterwards, or if the condom does not slip off during intercourse, she will not get pregnant. If the condom is used during ejaculation, which is an incorrect method of using condoms, or if the condom slips or falls off in the middle of the intercourse, or if the condom is broken, these may cause the sperm to enter the vagina and enter the uterine cavity, resulting in an unwanted pregnancy. The probability of pregnancy in this case may be about 20-30%, and may need to be remedied in time afterwards.