A woman's period starts between 21 and 35 days from the first day of her last period, notes the Office on Women's Health. For teens, the cycle may be 21 to 45 days from the first day of their last period. The average menstrual cycle is 28 days.
A woman's period is important for regulating hormones and plays a vital role in pregnancy. A period occurs when an egg is unfertilized. An unfertilized egg triggers the uterus to shed thickened lining that would have protected a fertilized egg during growth. The Office on Women's Health states that the average period lasts three to five days. Some women have week-long periods.Learn More
Hormonal changes that occur as a result of changing birth control pills, perimenopause or problem pregnancies can often cause excessive menstrual bleeding, according to the New York Times. Bleeding for longer than one week is considered abnormal menstrual bleeding and is reason to be seen by a gynecologist, states the New York Times.Full Answer >
A period can be about a week late before home pregnancy tests can accurately detect pregnancy, according to Central Carolina OB-GYN. If a woman is not pregnant, she may skip periods or have late periods for other reasons, notes pediatrician Jennifer Shu.Full Answer >
Many women may immediately assume that they are pregnant after missing a period for 17 days, but a late period can be caused by a number of circumstances and is not altogether uncommon, according to WebMD. These factors depend on the woman's age and medical history. Causes range from simple hormonal fluctuations to more serious conditions, such as polycystic ovary syndrome, or PCOS.Full Answer >
A period that is always late may indicate a longer than usual menstrual cycle, according to Everyday Health. While most women's menstrual cycle is 28 days, up to seven days plus or minus this is considered to be normal. If the cycle is longer than this, reasons for a late period can include emotional or physical stress, dieting, birth control pill use or a variety of underlying health problems.Full Answer >