Hello, I suggest you to undergo one blood test for beta-hCG to confirm pregnancy. It is more reliable. Besides pregnancy, late period could be due to PCOD, hormonal imbalance, mental stress, over weight/ extreme loss, emotional upset, irregular diet habit, high prolactin level, hypothyroidism etc. You must undergo one pelvic ultrasound scan and complete hormone profile (LH/ FSH, Prolactin, Thyroid, DHEAS, PPBS) to pinpoint the diagnosis. You may require combined hormonal pill to induce & regularize period along with other supportive treatment. You should control body wt, avoid stress, take healthy low carbohydrate diet with avoidance of fatty food and sleep properly. Be well.