Due to weight i dont have regular periods- for past 3 months getting light vaginal bleeding most days, no other problems, what could this mean?

Periods & weight: Patients who are markedly obese will have period irregularities including what you are experiencing. Moreover, the risk of endometrial hyperplasia and cancer is increased without weight reduction or the use of progesterone Rx to counteract the excess estrogen produced in the peripheral fat. Go see a GYN MD for evaluation and Rx until a serious weight reduction program is instituted.