If your previous cycles were regular and without any variation, and the current change has occurred for the first time, then it is likely that stress or anxiety could be the cause of your cycle changes.
Stress certainly plays a role in suppressing the functioning of the hypothalamus, which controls the pituitary gland — the body's master gland — which, in turn, controls the thyroid and adrenal glands and the ovaries; they all work together to manage hormones. Any change in the hormonal equilibrium can hence affect the menstrual cycle.
In most women who miss a cycle due to such issues, it is likely that they might get their next cycle as per their scheduled time.
Take proper rest and relax yourself. Stress can induce hormonal changes in the body. De-stressing with having proper sleep, healthy balanced diet, meditation, practicing deep breathing exercises (yoga, etc) can be helpful and will keep your menstrual cycles regular.
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