hello, I-pill may cause late period due to hormonal imbalance in association with mental stress. However, 70 days missed period is NOT normal. You must undergo one blood test for beta-hCG to confirm pregnancy. Besides pregnancy, late period could be due to PCOD, Thyroid problem, over weight/ extreme loss, mental stress, emotional upset, eating disorder, high prolactin. Therefore, I suggest to undergo one USG lower abdomen and hormone test in the absence of pregnancy. You may require hormonal pill to induce period. Kindly, consult with your gynecologist and take advice accordingly. You should control body wt, avoid stress, take healthy low carbohydrate diet with avoidance of fatty food and sleep properly. Be well.