I got my period 5 days early and i have been very tired lately during the day with a little back pain what could be the cause of it?

Some possibilities: An early menstrual period may be caused by changes in hormone levels, which can be due to anxiety, stress, overworking, intense exercise, fatigue, or excessive weight gain/loss. If pregnancy happens, a bit of spotting sometimes occurs 9-14 days after conception, and may seem to a woman that she's starting an early period. An ob-gyn doctor can check, if symptoms are worrisome or recurrent.