Hello,
There are several reasons of missed or late period besides pregnancy like
ovarian cyst or PCOS, hormonal imbalance, mental stress, over weight,
pelvic infection, anemia, improper diet habit etc.
However, you must exclude doubts of pregnancy by repeating the home pregnancy test or
blood test.
In absence of pregnancy, some other investigations like pelvic
ultrasound scan, hormone test (thyroid, LH/ FSH), blood Hb% & sugar etc may be required to pinpoint the diagnosis and give proper treatment. You can consult with your gynecologist for proper guidance.
You need to control or reduce body wt by regular physical exercise, avoid mental stress, take low
carbohydrate diet and hormonal medication.
Hope,it helps for you. Good luck.