Could me being overweight make my period be late?

im 19 and not sexually active and my period has been late for about 3 months..i know i am morbidly obese..so could this be the reason that my period is late? i had to go to a ginacologist about 6 months ago because my period wouldnt stop completely for about 3 months.during that visit the dr said i had ovarian cysts. i would love your opinions..thanks in advace!