The normal value of estrogen in women during menstruation is about 40-100 pmol/L. As long as it is within this range, it is relatively normal and there is basically nothing to worry about. The level of hormones in each person’s body is different, and the hormones in a woman’s body will change over time. During ovulation, the hormones in a woman’s body will increase faster and can reach the highest level. If a woman’s estrogen is low at this time, it may lead to low menstrual flow or amenorrhea and menopause, and other conditions that need timely treatment. When the estrogen level is low during menstruation, the endometrium will shed after losing hormonal support, which is a normal body reaction. If you find that you have irregular menstruation, it is recommended that you go to the hospital for a sex hormone six test.