Understand the female menstrual cycle, ovulation and periods

A woman's menstrual cycle is the number of days from the day she starts bleeding until the day before her next period starts, approximately 28 days. However this varies from cycle to cycle. In fact, 46% of menstrual cycles vary by seven or more days. Learn more about your cycle & put your knowledge to the test in our fertility quiz.
You probably already know quite a lot about your menstrual cycle – like how often you get your periods and how heavy they are.

Ovulation and menstruation at the same time: is this possible?

When Do I Ovulate?

Can you Ovulate Without Having a Period? Advanced Women's Healthcare: Dallas OBGYN

Can women stop having periods in the future centuries as an evolutionary change? - Quora

Ovulation and the phases of the menstrual cycle

What is the meaning of periods in a girl's/women life? - Quora

What is the definition of a period calendar? - Quora

Menstrual Cycle- Phases of Menstrual Cycle and Role of Hormones

What do periods look like? Can someone post a photo? - Quora