hello, There are several reasons of late period besides pregnancy like ovarian cyst or PCOD, hormonal imbalance, over wt/ extreme loss, stress, emotional upset, eating disorder, thyroid problem etc. Therefore, you need one USG lower abdomen with PPBS, LH/FSH, Thyroid profile, Blood Progesterone for complete evaluation. Kindly, consult with your gynecologist and take advice accordingly. Combined hormonal pill is quite effective to treat and regularize your period. You should control body wt, avoid stress, take healthy low carbohydrate diet with avoidance of fatty food and sleep properly. Be well.