In the presence of blood clots during menstruation, it is advisable to take oral medication, such as Yimoucao Combination, to regulate the menstruation first and avoid the situation where a large amount of blood clots may also accompany the menstruation on the 3rd-4th day. If possible, endocrine hormones should be checked on the 2nd-5th day of menstruation to rule out any abnormalities in hormone levels. When estrogen or progesterone is insufficient or too high, it may cause thickening of the endometrium, which may lead to heavy menstrual flow with blood clots. In this case, you can also take oral medication to stop bleeding, such as Yunnan Baiyao capsules or Baogong hemostatic granules. The purpose of oral medication is to avoid increased bleeding and blood clots, infection or anemia. If you have a clot every time you have a period, you should have a repeat ultrasound 3-5 days after your period to rule out any abnormalities in the uterus and adnexa.