When it comes to having irregular periods, it depends entirely on the hormones. A fluctuating hormonal level can cause periods to become irregular. Missing your periods for 2 months can be considered normal if there’re no other symptoms to watch out for. But if there’re other indications, there could be an underlying health issue, or you should be worried if you don’t get your periods for 3 to 6 months. You should definitely consult a doctor.