I have been bleeding for 4 and a half weeks now and no end in sight. Most days are light, however a few days out of the blue it will get heavy. No cramps, some dull pain in lower left back area, however not consistent. I am overweight and would like a suggestion of what it may be. I was taking prenatal vitamins, however discontinued after this ongoing period. Any help or answers of why this is happening will be greatly appreciated. In between doctors, due to a recent move.