Period 3 days late. pelvic pain in one side. bright red gush of blood with black clots. after period grayish/pink tissue in urine accompanied by nausea. weight gain6lbs before 8 lb weight loss after?

Pregnancy or.....: Pregnancy may be the most common reason. Other reasons include hormone imbalances (polycystic ovary syndrome, thyroid disease, pituitary problems, eating disorders). Sometimes caused by stress, but don't assume that's it. Especially with pain and a late period, you could have a tubal pregnancy, which is a serious condition. See your doctor.