Stress, weight fluctuations, hormonal imbalances, thyroid issues, anaemia, Polycystic Ovary Syndrome, excessive exercise, or pregnancy can all cause irregular or delayed periods. Do a pregnancy test first if you have a late period and are sexually active. Make an effort to eat a balanced diet, get enough sleep, exercise frequently, and manage your stress. Avoid taking hormone supplements on your own to induce menstruation. See a gynaecologist for a proper evaluation and potential blood tests or scans if your periods are frequently delayed, extremely painful, extremely heavy, or absent for longer than two to three months.