A woman can not get pregnant when she is not in her fertile window, which typically occurs during the middle of her menstrual cycle. This means that a woman must have regular, predictable periods to accurately predict when she may ovulate and thus become fertile. Other factors might affect fertility as well such as certain medical conditions or medications; if a woman has been diagnosed with any of these issues it is important to consult a doctor before attempting to conceive. Additionally, women who are past menopause will no longer be able to get pregnant due to the cessation of their monthly cycles and an inability for them to ovulate.