When are the safe and dangerous periods for pregnancy?

Pregnancy safety and danger periods are defined with reference to the ovulation period. Ovulation typically occurs 14 days before the next menstrual period begins. The four days before ovulation and five days after are considered the danger period (fertile window). The week before and after menstruation is relatively safer. Detailed explanation is as follows:

1. Danger Period

The danger period refers to the ovulation phase. In women with regular menstrual cycles, ovulation generally happens about 14 days before the next period. The four days before and five days after ovulation constitute the fertile window. Unprotected intercourse during this time carries a high risk of pregnancy, hence it's known as the pregnancy danger period.

2. Safety Period

The safety period includes all days excluding menstruation and the ovulation period. For women with regular cycles, the safer period usually falls about one week before and after menstruation.

However, the safety and danger periods are not absolutely reliable. In women with irregular cycles, it is difficult to accurately predict these periods. Therefore, it is recommended to use appropriate contraceptive methods during intercourse to prevent unintended pregnancy.