The first six days and the last six days of the cycle is considered safe for having intercourse without protection. For example,If the period begins on the 7th of the month then it is safe to have intercourse from 1st to 12th of the month.We would still advise you to use a condom as still there rare chances of pregnancy. It is better to be safe than sorry.
Regular period
Menstrual cycle is regulated by hormones and regular menstrual period occurs every month without any missing periods, depending upon your cycle length.
A variation of two to three days between menstrual cycles is normal and for some women, menstrual cycle is repeated almost regularly in every 28 days.
Although the period of the menstrual cycle can vary from 21 to 35 days, the average cycle lasts for 28 days.
Abnormal menstrual pattern
Menstrual bleeding normally lasts between two and seven days, with the average being five days and periods last for longer than seven days are
generally considered as abnormal