I am 43 years old and have had regular monthly periods that last about 4 to 5 days, however this month my period last 7 days it was heavy... then spotting for 2 days. It seemed to stop then 2 days later spotting started again.... then a day later my flow started all over again, I m now in the 7 day and have to change pads at least every 2 hours.... what could be the problem?