If you have intercourse two days before your period and wear a condom, as long as the condom is worn correctly, you generally will not get pregnant, but there is a possibility of pregnancy if the condom is worn incorrectly or if you wear a condom in the middle of intercourse. If you wear a condom correctly throughout intercourse, you will not get pregnant in most cases, regardless of whether your menstrual cycle is normal or not. However, for those who wear a condom in the middle of intercourse, the prostate fluid contains a small amount of sperm, and as long as it is at the time of ovulation, there is a possibility of pregnancy, and the ovulation period also has uncertainty. Therefore, two days before menstruation intercourse and wear a condom, whether it will be pregnant and condom wearing method, wearing time, ovulation and so on have a certain relationship. For women who do not want to have children, no matter when they have intercourse, they need to take effective contraceptive measures.