The days before the onset of menstruation are in principle not in the ovulation phase, but in the luteal secretion phase, there is no mature follicle, so there is no way to combine with the sperm, and it will not cause pregnancy. However, some women will have irregular menstruation, when there is irregular menstruation, it can cause ovulation disruption, due to environmental changes, stress factors, this time will produce ovulation, it can cause fertilization. There are even a percentage of women who ovulate not in the middle of their period, but about a week before their period, and this is when conception can be caused. So make sure you have a detailed evaluation to assess where you fall and if you really don’t want to take oral emergency contraceptives, wait patiently for your period. If your period comes normally, it means that you are not pregnant. If your period is delayed, be sure to buy a pregnancy test 12 days after intercourse to rule out the possibility of conception.