1. Reasons for how long it takes to detect pregnancy after menopause. How long it takes to detect pregnancy after menopause is a question that many women are concerned about. In fact, how long it takes to detect pregnancy after menopause depends on many factors, including the woman\’s menstrual cycle, ovulation time, and the time for the fertilized egg to implant. Let’s take a closer look below. 2. The impact of menstrual cycle on how long it takes to detect pregnancy after menopause. Women’s menstrual cycle