If you do not have 2 periods in a month, you need to exclude physiological factors. When bleeding occurs in the middle of menstruation consider that it will be bleeding during ovulation and can cause bleeding that has a similar amount to menstruation or even less than the amount of menstruation. If this is the first time it occurs, it can be observed as it will be over in 3-7 days and will not affect your health. If it happens frequently, take an oral artificial cycle for regulation. For example, if you have 2 periods in a month, you can’t rule out the existence of endocrine hormone problems, such as polycystic ovary syndrome, luteal insufficiency and hypothyroidism, which can cause 2 periods in a month, so you should also pay high attention to them. Uterine fibroids and endometrial polyps can also cause bleeding during non-menstrual periods. Therefore, you can go to the hospital for ultrasound examination to determine if there are any abnormalities in the vagina and uterus.