It often takes up to 2 years for a regular pattern to develop in a menstruation cycle. Until the female is out of puberty there can be irregularities in the cycle. The menstrual cycle itself generally lasts for 28 days, but can last anywhere between 24-35 days. After puberty a regular length of time between periods normally occurs. Menstrual bleeding can last from 2 to 7 days with the average being about 5 days.
The menstrual cycle is the process involving the forming of an egg in the ovaries and the lining of the womb to receive the egg, if it is fertilised, to grow into a baby. The lining of the womb is called the endometrium and the egg sticks to this layer if it is fertilised. If the egg is not fertilised then the endometrium, along with blood from where the endometrium detached, slips out. The expelling of the endometrium from the inside of the uterus is triggered by changes in the hormones of the woman.
A change in the balance of hormone levels can also affect the menstruation cycle. The hormones oestrogen and progesterone regulate the menstrual cycle, so if there is an imbalance in their intake then they could change when a period may occur. It is these hormones that are present in the contraceptive pill.
Several reasons your period can be early:
The menstrual cycle is the process involving the forming of an egg in the ovaries and the lining of the womb to receive the egg, if it is fertilised, to grow into a baby. The lining of the womb is called the endometrium and the egg sticks to this layer if it is fertilised. If the egg is not fertilised then the endometrium, along with blood from where the endometrium detached, slips out. The expelling of the endometrium from the inside of the uterus is triggered by changes in the hormones of the woman.
A change in the balance of hormone levels can also affect the menstruation cycle. The hormones oestrogen and progesterone regulate the menstrual cycle, so if there is an imbalance in their intake then they could change when a period may occur. It is these hormones that are present in the contraceptive pill.
Several reasons your period can be early:
- Change in contraception can affect the menstruation cycle. Particularly when first used, contraceptive pills can cause bleeds, which are generally shorter than normal periods. These normally stop after the first few months of use.
- A hormone imbalance can occur due to many other factors. Some of these could be lifestyle, such as being severely under or over weight, heavy exercise or stress.
- There could also be changes due to age, particularly for women in or just out of puberty, or for those just approaching menopause.