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This sometimes happens, and there are a few different reasons. Dysfunctional uterine bleeding is usually caused by changes in hormone levels. This can be because an ovary doesn't release an ovum (anovulation) and result in either frequent or heavy periods. Polycystic ovary syndrome is another possibility. Stress, money problems, problematic family relationships can also cause periods to be irregular. So can the beginnings of an early menopause, but you are still young, even for early menopause.
Since this isn't a one-time thing, you do need to make an appointment to be seen. It's probably nothing serious at all, but you do want to find out the cause for sure.