Breast swelling and pain before menstruation and now there is none is usually not pregnancy. Before menstruation, as estrogen and progesterone levels are at a high level, some women may exhibit breast tenderness and pain, or even low-grade fever, irritability, irritability, and other PMS manifestations. Before the onset of menstruation, estrogen and progesterone will drop and retreat to their lowest values, i.e., the onset of menstruation, and at the same time, breast swelling and pain will also disappear slowly. In the case of pregnancy, there is no drop in hormone levels, so breast tenderness may persist for a longer period of time. However, if there is persistent breast tenderness and your period is delayed, it is advisable to test with a pregnancy test to see if you are pregnant. It is also recommended to do regular screening for breast diseases to detect them early, and to go to the hospital and consult a physician for guidance if you have any symptoms of discomfort.