It is possible to get pregnant if you ejaculate within the 5th day after your period. If your menstrual cycle is more regular around 30 days and your period lasts for less than 5 days, you will not get pregnant. If your menstrual cycle is short and your period lasts longer than 5 days, you may get pregnant. Under normal circumstances, the estrogen level in your body will gradually rise after your period ends, stimulating the follicles to start developing, and after about 7-10 days the follicles will mature and ovulate, and the follicles will survive for about 2 days after they are expelled, during which time they will form a fertilized egg when they meet sperm. If the menstrual cycle is 25 days long, the ovulation day is on the 11th day of the menstrual cycle. If the menstruation lasts for 5 days, the 5th day after the menstruation is clean is equivalent to the 10th day of the menstrual cycle, and there is a possibility of pregnancy if you have intercourse at this time without contraceptive measures.