It is possible to have intercourse on the sixth day after ovulation. After the egg is ovulated, most of them will die naturally in about 24 hours if they are not fertilized. Therefore, if it is on the sixth day after ovulation, the egg has already died and it is not possible to get pregnant by having intercourse at this time, which is also known as the safe period. However, it is important to note that the time of ovulation must be determined. If it is not determined or if you cannot remember it, it may cause pregnancy. The time of ovulation can only be calculated when you have regular periods and the time of ovulation can be deduced from the time of ovulation. In the case of irregular menstruation, the calculated ovulation time is not accurate. If you want to take birth control during the safe period, you must have a regular period before you can take birth control during the safe period.