My period is not coming time to time

How to restore your menstrual cycle to regularity?
    Change lifestyle by staying away from stress and physical and psychological stress
    Hormone therapy. The menstrual cycle is often irregular due to lack or imbalance in certain hormones in the body
    A hormone called progestin can also help stimulate menstrual cycle in women who do not get it, but under the supervision of a obstetrician
    Treatment of ovarian cyst, diabetes, thyroid disease, and hormones in general
    Eat a balanced diet.
    Avoid smoking
    Avoid caffeine.
Causes of delayed menstruation ?
    Stress, emotional, anxiety
    Women who engage in extreme exercise such as running and weightlifting
    Obesity
    Polycystic Ovary Syndrome
    Chronic diseases such as diabetes and gastrointestinal disorders can also affect the menstrual cycle.
    Thyroid problems
What are the necessary tests in your case?
    Clinical examination by obstetricians and gynecologists
    Take the history
    blood test
    Check pregnancy
    Check sugar
    Check thyroid function
    Examination of female hormones
    Examination of the uterus and ovaries by ultrasound