How many days after your period is a safe period depends on how long your period lasts. The safe period is within the 8th day of menstruation.
If a woman has a regular period, the safe period is 7 days before and 8 days after the onset of menstruation. So the 8th day after the onset of menstruation is considered safe. Some women who have short periods, such as a period that clears in 4 days, have a safe period for 4 days after their period clears.
However, if a woman’s period is irregular, ultrasound or ovulation test paper should be used to detect ovulation.
Safe period is not an absolute safe period, just that the chances of conception are smaller compared to the ovulation period. For women who do not intend to get pregnant, they should be careful to use condoms and other means of contraception to avoid the possibility of unwanted pregnancy.