Every month follicular rupture takes place around 12 to 14 days of an average menstrual cycle and this process is called ovulation. Around this time hormonal changes take place and the uterus is prepared for pregnancy. If ovulation takes place and the egg isn't fertilized, the lining of the uterus sheds through the vagina. This is a menstrual period.
Menstrual cycle length may vary by 2 to 3 days every month. Period might be light or heavy, painful or pain-free, long or short, and still be considered normal. Within a broad range, "normal" is what's normal for a body.
When one gets close to menopause, cycle may become irregular again. However, because the risk of uterine cancer increases as age advances, any irregular bleeding around menopause should be discussed with health care provider.
If you're concerned about your periods, then also make note of the following every month:
Menstrual cycle irregularities can have many different causes, including: