I'm 39, have 6 kids and have had 2 miscarriages. my period is like clockwork. i am now about 7-8 days late for my period. took pregnancy test this a.m., negative. back pain since missing period, light vaginal discharge. vivid dreams and tiredness. ?

Late /missed period: Reasons for missed /late periods: low body weight, obesity, marked weight gain or loss, over-exercise such as in endurance athletes, breast-feeding, stress, illness, eating disorders (bulimia or anorexia), travel, hormone irregularities, drug use, medications (i.e., birth control) or med problem (polycystic ovary syndrome or Asherman’s syndrome. #1 reason is pregnancy. Can retake HPT in a week.