Hello, Besides pregnancy, there are several reasons of late period like Poly Cystic Ovary, hormonal imbalance, over weight/ extreme loss, mental stress, emotional upset, eating disorder, thyroid problem etc. Therefore, I suggest to undergo one USG lower abdomen and hormone test in the absence of pregnancy. You may require regular hormonal pill to treat irregular period if you don t get withdrawal bleeding after taking Naturogest. Kindly, consult with your gynecologist for proper guidance. You should control body wt, avoid stress, take healthy low carbohydrate diet with avoidance of fatty food and sleep properly. Be well and practice safe sex in future.