What are the chances of getting pregnant? The chances of getting pregnant are mainly affected by many factors, including a woman\’s age, ovulation cycle, reproductive health, etc. Generally speaking, healthy young women have about a 20% chance of becoming pregnant during their ovulation cycle each month. But it changes with age and the condition of the reproductive system. The following are specific examples: Age: The menstrual cycle of women aged 20 to 25 is generally 28 days, and ovulation occurs during the menstrual period.