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A period happens because of changes in hormones in the body. The ovaries release the female hormones estrogen and progesterone. These hormones cause the lining of the uterus (or womb) to build up. The built-up lining is ready for a fertilized egg to attach to and start developing.
Change in normal routine Changes in your normal routine can affect your hormones and cause your period to come early or late. For example, some research suggests that people who switch between day and night shifts, like nurses, often experience irregular periods. This may, in turn, disrupt the sleep hormone melatonin.
A range of factors can cause a period to be early. Early periods often result from hormonal changes, especially during puberty and perimenopause. Many underlying medical conditions can also cause menstrual irregularities.
Stress levels often affect your hypothalamus, the part of your brain that controls your hormone levels, and can cause illness or sudden fluctuations in your weight two things that can throw your period out of whack. That means you may find yourself with an irregular period, which means it can come early *or* late.
This is because your hormone levels drop. It is also called breakthrough bleeding, and usually happens about 2 weeks after your last period. Other hormonal contraceptives such as hormone containing intrauterine devices (IUD's) contraceptive injections or rods can also cause breakthrough bleeding or irregular periods.
Pregnant women can have some light irregular bleeding during pregnancy, but it should not be like a normal period. Some women can confuse this for their period because often it can come right around the time she was expecting her normal period. Learn more about getting pregnant while on your period.
Every month or so, the uterus lining gets thicker to prepare for a fertilized egg if the woman becomes pregnant. If the egg doesn't get fertilized, that lining is released from the body as blood through the vagina. This monthly process is called menstruation or a period.
A period happens because of changes in hormones in the body. The ovaries release the female hormones estrogen and progesterone. These hormones cause the lining of the uterus (or womb) to build up. The built-up lining is ready for a fertilized egg to attach to and start developing.

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