Dear rfrancis, Recommendations from the American Cancer Society do not specify that their is a better time of the menstrual cycle to have a mammogram. The recommendations are that it is more important to have the screening mammogram scheduled than to try to coincide it with a specific time of the menstrual cycle. However, if you experience breast discomfort or pain prior to your menstrual cycle, you may want to schedule your mammogram for a different time in your cycle.