Regl, also known as period or menstruation, is regular discharge of blood and mucosal tissue every month in a woman. Regl is a sign that pregnancy most probably has not occurred. Period of the menstruation is between 21 and 45 days in young woman, and 21 to 31 days in adults.
First enter the last regl date. Then enter your regl period. The next regl date will be calculated automatically.