What are the physical reactions one week before menstruation?

Patient's question:

Symptom Description: How was the body's reaction one week before the menstrual period?? Breast swelling, is it pregnancy or preparing for menstruation??？？For a virgin, will the menstrual period be delayed after the first ML?? Why was it delayed for 5 days and still hasn't arrived? Effective contraception was used. Past Treatment and Effect: Primary dysmenorrhea What kind of help do you want: Body reactions one week before the menstrual period

Doctor's answer:

Generally, before the onset of menstruation, women may experience breast and lower abdominal discomfort. This is caused by excessively high levels of sex hormones before menstruation, and the symptoms usually disappear after the period. The first sexual experience is related to delayed menstruation. If pregnancy is ruled out, your current delayed menstruation may be due to excessive mental stress, such as overly worrying about whether you are pregnant, which can cause stress and lead to delayed menstruation. After sexual intercourse, menstrual disorders may occur. If your menstrual cycle is delayed by more than one week, you can take a pregnancy test or undergo an ultrasound examination to confirm whether pregnancy is possible.