It is normal for women to have their menstrual cycle earlier or later than 1 week, but for women who have sex without contraception, their menstrual cycle is normally regular and suddenly appears more than 7 days later, accompanied by chest swelling and pain, increased appetite, increased body temperature, drowsiness and weakness. The first thing to consider is whether the chest swelling and the postponed menstrual cycle are caused by pregnancy. So at this time, it is recommended to first buy a test paper or pregnancy test to test whether you are pregnant or not. Or go directly to the gynecology department of the hospital to check the blood HCG, and ultrasound to confirm whether you are pregnant, as well as to see the thickness of the lining.