Can you be pregnant 5 days before menstruation

If the female menstrual cycle is relatively regular, according to the physiological cycle calculation, in the first 5 days of menstruation belongs to the safe period, this time the same room is not pregnant. However, it is recommended to observe the time of the next menstrual cramps, if there is a menstrual delay of more than a week can use a pregnancy test stick to detect pregnancy.