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Although it may seem like your menstrual cycle runs like clockwork, always appearing on the expected day, the likelihood is that at least part of the time, your cycle is out of sync, showing up too early, too late, or not at all, even though you’re not pregnant. Irregular periods not only make it hard to determine when you ovulate, but they can also indicate that your reproductive system is in need of fine-tuning. In this section, we discuss all the ways cycles can get out of sync, what it can mean, and how your doctor may suggest fixing them.

Menstrual cycles that don’t fall into the norm can indicate that you’re not ovulating at all or that you’re only ovulating occasionally. An occasional irregular cycle can be brought about by stress; a change in routine, exercise, or eating patterns; or illness, but periods that are “never the same length twice,” consistently shorter than normal or longer than normal, should be evaluated by your doctor.