Why is your period coming up a week earlier every month?

Menstruation is one week ahead of schedule every month. There are two possibilities: 1. If it has always been, this situation indicates that the menstrual cycle is relatively short, and the female menstrual cycle is only 23 days, but the endocrine in the female body is normal, which has little impact on the human body. 2, if the menstrual cycle is usually about 28 days to once, the most recent period of time is found to be a week in advance, this situation should be suspected to be caused by insufficient corpus luteum function in the body, due to premature atrophy of corpus luteum, it will cause menstrual cramps, you can take blood on the 22nd day of menstruation to test the progesterone level in the body, if progesterone is relatively low, you can take medication.