If you do not have your period by the time you get your period and you have breast pain, it is best to rule out the possibility of pregnancy first in this clinical situation, and you can use early pregnancy test paper to detect it. If the result is negative, it is often caused by endocrine disorders, such as high secretion of estrogen and relatively low secretion of androgen, which can lead to breast swelling and pain. It is recommended to take progesterone pills orally, which can improve the symptoms of breast pain on the one hand, and have the effect of promoting menstruation on the other. If you still do not get your period on the 8th day after stopping the medication, you must go to the hospital for a detailed examination to rule out the possibility of organic lesions.