1. What is the probability of pregnancy in dangerous periods? The dangerous period refers to the period before and after ovulation in a woman\’s menstrual cycle. Because the chance of pregnancy is higher at this time, it is also called the \”fertile period.\” The risk period pregnancy probability is how likely a woman is to conceive during this time period. 2. How to calculate the probability of pregnancy during dangerous periods? 1. Calendar method: Calculate ovulation day and risk period based on menstrual cycle. 2. Basal body temperature method: Determine ovulation day and risk period by recording changes in basal body temperature. 3. Detect ovulation test paper: Determine ovulation day and risk period by detecting the level of luteinizing hormone in urine. three,