If a woman who has intercourse without contraception and usually has a regular menstrual cycle suddenly experiences a delay of more than a week in the menstrual cycle, accompanied by back pain and abdominal distension, it is often necessary to consider that pregnancy is caused by, and it may be caused by ectopic pregnancy. Because this kind of women because the fertilized egg did not in the uterine cavity bed, so in the uterus outside the growth and development, will stimulate the fallopian tube localization and cause abdominal distension and back pain discomfort performance. However, if a woman’s menstrual cycle is delayed and she is not sexually active, then the back pain and abdominal distension is often considered to be a physiological manifestation of pelvic and uterine congestion that leads to impending menstruation, so you just need to continue to wait for menstruation to come.