While a woman's fertility is influenced by various factors, there are specific periods during which conception is less likely. Typically, a woman is less likely to get pregnant during her menstrual period, as this is considered a low fertility phase. However, it's important to note that sperm can survive for several days in the female reproductive system, so conception is still possible. Women nearing menopause, usually in their late 40s to early 50s, may experience a decline in fertility as their egg supply diminishes. Additionally, certain medical conditions, hormonal imbalances, or lifestyle factors like extreme stress or significant weight fluctuations can affect fertility. Understanding when can a woman not get pregnant aids in family planning decisions. For accurate insights into personal fertility, consulting with a healthcare professional is advisable, ensuring informed choices regarding conception and reproductive health.