If the menstrual period is clean for 6 days, and the menstrual cycle is 28-30 days, and you have intercourse on the 8th day of the menstrual period, you basically won’t get pregnant at this time, mainly because you are still in the follicular phase, and you haven’t entered the ovulation phase. If you have intercourse on the 8th day, the survival time of the sperm is 11 days at the longest, and it is only at the 12th day that it enters the ovulation period, so the sperm is already dead before it enters the ovulation period, and you won’t get pregnant at this time. If the menstrual cycle is relatively short, such as less than 25 days a mid-menstrual period, in the 8th day of menstruation when intercourse, it is recommended to give contraception, because the clinically calculated time of ovulation is not absolute, but only relative, some people may be ahead of the ovulation 1-2 days, there may be pushed back 1-2 days of ovulation, so for the menstrual cycle of the shorter women, if the period of intercourse on the 8th day of the menstruation. It is best to use contraception.